Added a comment

and fixed a "typo" in the method parseDurationString replacing Long with Integer.

These are not the droids you are looking for wb9688 😁

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeParsingHelper.java

@@ -108,7 +108,12 @@ public class YoutubeParsingHelper {
         return host.equalsIgnoreCase("invidio.us") || host.equalsIgnoreCase("dev.invidio.us") || host.equalsIgnoreCase("www.invidio.us") || host.equalsIgnoreCase("invidious.snopyta.org") || host.equalsIgnoreCase("de.invidious.snopyta.org") || host.equalsIgnoreCase("fi.invidious.snopyta.org") || host.equalsIgnoreCase("vid.wxzm.sx") || host.equalsIgnoreCase("invidious.kabi.tk") || host.equalsIgnoreCase("invidiou.sh") || host.equalsIgnoreCase("www.invidiou.sh") || host.equalsIgnoreCase("no.invidiou.sh") || host.equalsIgnoreCase("invidious.enkirton.net") || host.equalsIgnoreCase("tube.poal.co") || host.equalsIgnoreCase("invidious.13ad.de") || host.equalsIgnoreCase("yt.elukerio.org");
     }
 
-    public static long parseDurationString(String input)
+    /**
+     * Parses the duration string of the video expecting ":" or "." as seperators
+     * @return the duration in seconds
+     * @throws ParsingException when more than 3 seperators are found
+     */
+    public static int parseDurationString(String input)
             throws ParsingException, NumberFormatException {
         // If time separator : is not detected, try . instead
         final String[] splitInput = input.contains(":")
@@ -143,10 +148,10 @@ public class YoutubeParsingHelper {
                 throw new ParsingException("Error duration string with unknown format: " + input);
         }
 
-        return ((Long.parseLong(Utils.removeNonDigitCharacters(days)) * 24
-                + Long.parseLong(Utils.removeNonDigitCharacters(hours))) * 60
-                + Long.parseLong(Utils.removeNonDigitCharacters(minutes))) * 60
-                + Long.parseLong(Utils.removeNonDigitCharacters(seconds));
+        return ((Integer.parseInt(Utils.removeNonDigitCharacters(days)) * 24
+                + Integer.parseInt(Utils.removeNonDigitCharacters(hours))) * 60
+                + Integer.parseInt(Utils.removeNonDigitCharacters(minutes))) * 60
+                + Integer.parseInt(Utils.removeNonDigitCharacters(seconds));
     }
 
     public static String getFeedUrlFrom(final String channelIdOrUser) {