Remove Limit time from Megavideo
First Solution:
Download this add-on for Mozilla and disable the annoying time & video streaming limitations imposed by platforms like Mega Video, Veoh, Mega Upload, Rapid Share.
The widget is called Illimitux.

If you are not using Mozilla or simply don't know about this browser, please use this link to download it:
http://www.mozilla.com/en-US/products/download.html
Second Solution:
1. When you click play on a
Mega Video player, click pause and allow the video to buffer all the way to the end.
2. Once the video is done buffering, go to your menu bar on your browser. Click the
File on the upper left hand side of the web browser and select
Work Offline.
3. Watch video.
4. De-select the
Work Offline button