SpikeTV and A&E have 3-6 hours of CSI or CSI:Miami on every day of the week, and sometimes go all day on the weekends. I often watch the 3-6 hours of CSI during the weekdays without noticing that the sun goes down, so I can imagine I could watch 50 hours of CSI, given that I could sleep. I could definitely watch 50 hours of Grey's Anatomy, probably without sleep. I don't know if there is 50 hours of Absolutely Fabulous, but if there is I could probably do that one as well if I were in the mood. I can't think of anything else.