I have enabled Preloading for my Watch Later playlist. This currently contains 23 hour-long Google IO videos but YouTube seems to only ever preload up to 2 of them, never any more.
I have an HTC One X with over 24GB of space - I have to remove a video from the playlist that has been downloaded to allow another to begin.
Everywhere I search gives no details about limits on how much you can preload so I was wondering if anyone else knows anything about this or has seen anything similar?