Great lists, Kier and MrBarlow, and thanks for the innovation and humour, Deadite.
Interestingly, there are two long films vying for contention on my list:
Shoah and
Dekalog I'm putting one of them on because, like Kier said, this situation would give you time to watch at least one lengthy film which is considered great and you'd be able to pace yourself and come out of self-isolation being able to say that you'd seen something 'worthy' and 'cultural'.
Also, with time to watch a nine hour documentary on the Holocaust, you would probably have some sense of perspective on your current situation and grew to appreciate the preciousness of life. If you think your current situation is bad, it could be worse. Don't worry, there's also some light entertainment in the box to enjoy afterwards!