diff --git a/src/libgreen/sched.rs b/src/libgreen/sched.rs
index b9144047df5..e0415470828 100644
--- a/src/libgreen/sched.rs
+++ b/src/libgreen/sched.rs
@@ -1029,6 +1029,7 @@ mod test {
     use std::rt::task::TaskOpts;
     use std::rt::task::Task;
     use std::rt::local::Local;
+    use std::time::Duration;
 
     use {TaskState, PoolConfig, SchedPool};
     use basic;
@@ -1291,7 +1292,7 @@ mod test {
         // doesn't exit before emptying the work queue
         pool.spawn(TaskOpts::new(), proc() {
             spawn(proc() {
-                timer::sleep(10);
+                timer::sleep(Duration::milliseconds(10));
             });
         });
 
diff --git a/src/libstd/io/net/tcp.rs b/src/libstd/io/net/tcp.rs
index 76368ac2821..34ccf9e617a 100644
--- a/src/libstd/io/net/tcp.rs
+++ b/src/libstd/io/net/tcp.rs
@@ -171,13 +171,14 @@ impl TcpStream {
     /// # #![allow(unused_must_use)]
     /// use std::io::timer;
     /// use std::io::TcpStream;
+    /// use std::time::Duration;
     ///
     /// let mut stream = TcpStream::connect("127.0.0.1", 34254).unwrap();
     /// let stream2 = stream.clone();
     ///
     /// spawn(proc() {
     ///     // close this stream after one second
-    ///     timer::sleep(1000);
+    ///     timer::sleep(Duration::seconds(1));
     ///     let mut stream = stream2;
     ///     stream.close_read();
     /// });
diff --git a/src/libstd/io/timer.rs b/src/libstd/io/timer.rs
index 3045871ce7a..39c6c74e45e 100644
--- a/src/libstd/io/timer.rs
+++ b/src/libstd/io/timer.rs
@@ -38,15 +38,16 @@ use rt::rtio::{IoFactory, LocalIo, RtioTimer, Callback};
 /// # fn main() {}
 /// # fn foo() {
 /// use std::io::Timer;
+/// use std::time::Duration;
 ///
 /// let mut timer = Timer::new().unwrap();
-/// timer.sleep(10); // block the task for awhile
+/// timer.sleep(Duration::milliseconds(10)); // block the task for awhile
 ///
-/// let timeout = timer.oneshot(10);
+/// let timeout = timer.oneshot(Duration::milliseconds(10));
 /// // do some work
 /// timeout.recv(); // wait for the timeout to expire
 ///
-/// let periodic = timer.periodic(10);
+/// let periodic = timer.periodic(Duration::milliseconds(10));
 /// loop {
 ///     periodic.recv();
 ///     // this loop is only executed once every 10ms
@@ -61,9 +62,10 @@ use rt::rtio::{IoFactory, LocalIo, RtioTimer, Callback};
 /// # fn main() {}
 /// # fn foo() {
 /// use std::io::timer;
+/// use std::time::Duration;
 ///
 /// // Put this task to sleep for 5 seconds
-/// timer::sleep(5000);
+/// timer::sleep(Duration::seconds(5));
 /// # }
 /// ```
 pub struct Timer {
@@ -123,9 +125,10 @@ impl Timer {
     ///
     /// ```rust
     /// use std::io::Timer;
+    /// use std::time::Duration;
     ///
     /// let mut timer = Timer::new().unwrap();
-    /// let ten_milliseconds = timer.oneshot(10);
+    /// let ten_milliseconds = timer.oneshot(Duration::milliseconds(10));
     ///
     /// for _ in range(0u, 100) { /* do work */ }
     ///
@@ -135,9 +138,10 @@ impl Timer {
     ///
     /// ```rust
     /// use std::io::Timer;
+    /// use std::time::Duration;
     ///
     /// // Incorrect, method chaining-style:
-    /// let mut five_ms = Timer::new().unwrap().oneshot(5);
+    /// let mut five_ms = Timer::new().unwrap().oneshot(Duration::milliseconds(5));
     /// // The timer object was destroyed, so this will always fail:
     /// // five_ms.recv()
     /// ```
@@ -173,9 +177,10 @@ impl Timer {
     ///
     /// ```rust
     /// use std::io::Timer;
+    /// use std::time::Duration;
     ///
     /// let mut timer = Timer::new().unwrap();
-    /// let ten_milliseconds = timer.periodic(10);
+    /// let ten_milliseconds = timer.periodic(Duration::milliseconds(10));
     ///
     /// for _ in range(0u, 100) { /* do work */ }
     ///
@@ -191,9 +196,10 @@ impl Timer {
     ///
     /// ```rust
     /// use std::io::Timer;
+    /// use std::time::Duration;
     ///
     /// // Incorrect, method chaining-style.
-    /// let mut five_ms = Timer::new().unwrap().periodic(5);
+    /// let mut five_ms = Timer::new().unwrap().periodic(Duration::milliseconds(5));
     /// // The timer object was destroyed, so this will always fail:
     /// // five_ms.recv()
     /// ```
diff --git a/src/libsync/comm/mod.rs b/src/libsync/comm/mod.rs
index 45016b97566..e4df661b562 100644
--- a/src/libsync/comm/mod.rs
+++ b/src/libsync/comm/mod.rs
@@ -128,10 +128,11 @@
 //!
 //! ```no_run
 //! use std::io::timer::Timer;
+//! use std::time::Duration;
 //!
 //! let (tx, rx) = channel::<int>();
 //! let mut timer = Timer::new().unwrap();
-//! let timeout = timer.oneshot(10000);
+//! let timeout = timer.oneshot(Duration::seconds(10));
 //!
 //! loop {
 //!     select! {
@@ -150,12 +151,13 @@
 //!
 //! ```no_run
 //! use std::io::timer::Timer;
+//! use std::time::Duration;
 //!
 //! let (tx, rx) = channel::<int>();
 //! let mut timer = Timer::new().unwrap();
 //!
 //! loop {
-//!     let timeout = timer.oneshot(5000);
+//!     let timeout = timer.oneshot(Duration::seconds(5));
 //!
 //!     select! {
 //!         val = rx.recv() => println!("Received {}", val),
diff --git a/src/test/run-pass/core-run-destroy.rs b/src/test/run-pass/core-run-destroy.rs
index 34f1e681608..9cee83a8598 100644
--- a/src/test/run-pass/core-run-destroy.rs
+++ b/src/test/run-pass/core-run-destroy.rs
@@ -25,6 +25,7 @@ extern crate green;
 extern crate rustuv;
 
 use std::io::{Process, Command};
+use std::time::Duration;
 
 macro_rules! succeed( ($e:expr) => (
     match $e { Ok(..) => {}, Err(e) => fail!("failure: {}", e) }
@@ -115,7 +116,7 @@ pub fn test_destroy_actually_kills(force: bool) {
     // Don't let this test time out, this should be quick
     let (tx, rx1) = channel();
     let mut t = timer::Timer::new().unwrap();
-    let rx2 = t.oneshot(1000);
+    let rx2 = t.oneshot(Duration::milliseconds(1000));
     spawn(proc() {
         select! {
             () = rx2.recv() => unsafe { libc::exit(1) },
diff --git a/src/test/run-pass/issue-12684.rs b/src/test/run-pass/issue-12684.rs
index 37e675b52eb..e21338746be 100644
--- a/src/test/run-pass/issue-12684.rs
+++ b/src/test/run-pass/issue-12684.rs
@@ -13,6 +13,8 @@ extern crate native;
 extern crate green;
 extern crate rustuv;
 
+use std::time::Duration;
+
 #[start]
 fn start(argc: int, argv: *const *const u8) -> int {
     green::start(argc, argv, rustuv::event_loop, main)
@@ -24,6 +26,6 @@ fn main() {
 
 fn customtask() {
     let mut timer = std::io::timer::Timer::new().unwrap();
-    let periodic = timer.periodic(10);
+    let periodic = timer.periodic(Duration::milliseconds(10));
     periodic.recv();
 }
diff --git a/src/test/run-pass/issue-12699.rs b/src/test/run-pass/issue-12699.rs
index c24128f97e3..6b6e770bc99 100644
--- a/src/test/run-pass/issue-12699.rs
+++ b/src/test/run-pass/issue-12699.rs
@@ -12,6 +12,7 @@
 extern crate native;
 
 use std::io::timer;
+use std::time::Duration;
 
 #[start]
 fn start(argc: int, argv: *const *const u8) -> int {
@@ -19,5 +20,5 @@ fn start(argc: int, argv: *const *const u8) -> int {
 }
 
 fn main() {
-    timer::sleep(250);
+    timer::sleep(Duration::milliseconds(250));
 }
diff --git a/src/test/run-pass/issue-9396.rs b/src/test/run-pass/issue-9396.rs
index 9f08f1db410..c16319a16f2 100644
--- a/src/test/run-pass/issue-9396.rs
+++ b/src/test/run-pass/issue-9396.rs
@@ -10,12 +10,13 @@
 
 use std::comm;
 use std::io::timer::Timer;
+use std::time::Duration;
 
 pub fn main() {
     let (tx, rx) = channel();
     spawn(proc (){
         let mut timer = Timer::new().unwrap();
-        timer.sleep(10);
+        timer.sleep(Duration::milliseconds(10));
         tx.send(());
     });
     loop {
diff --git a/src/test/run-pass/tcp-connect-timeouts.rs b/src/test/run-pass/tcp-connect-timeouts.rs
index 6f6fff15814..1bdd06ca0e9 100644
--- a/src/test/run-pass/tcp-connect-timeouts.rs
+++ b/src/test/run-pass/tcp-connect-timeouts.rs
@@ -38,6 +38,7 @@ macro_rules! iotest (
             use std::io::net::tcp::*;
             use std::io::test::*;
             use std::io;
+            use std::time::Duration;
 
             fn f() $b
 
@@ -72,7 +73,7 @@ iotest!(fn eventual_timeout() {
 
     let mut v = Vec::new();
     for _ in range(0u, 10000) {
-        match TcpStream::connect_timeout(addr, 100) {
+        match TcpStream::connect_timeout(addr, Duration::milliseconds(100)) {
             Ok(e) => v.push(e),
             Err(ref e) if e.kind == io::TimedOut => return,
             Err(e) => fail!("other error: {}", e),
@@ -87,11 +88,11 @@ iotest!(fn timeout_success() {
     let port = addr.port;
     let _l = TcpListener::bind(host.as_slice(), port).unwrap().listen();
 
-    assert!(TcpStream::connect_timeout(addr, 1000).is_ok());
+    assert!(TcpStream::connect_timeout(addr, Duration::milliseconds(1000)).is_ok());
 })
 
 iotest!(fn timeout_error() {
     let addr = next_test_ip4();
 
-    assert!(TcpStream::connect_timeout(addr, 1000).is_err());
+    assert!(TcpStream::connect_timeout(addr, Duration::milliseconds(1000)).is_err());
 })