I have had DVR with both time warner and fios. I would highly recommend both. The shows last until you erase them. You can do 2 at one time if TV is off. If watching tv in order to record 2 you have to watch one, otherwise you can record one show and watch something else. I think it was this way for both. The FIOS is probably a little better quality but the TWC box holds much more. Hope this helps!