I tried, but could barely find any so-called "epic" that I really liked. I like plenty of 14-18 minutes songs, but pretty much everything I've heard in rock music above 20 minutes long is just some bunch of songs badly put together with no sense of form (and even if I will probably get insulted for that, I don't think the Yes, Genesis, Jethro Tull classic "epics" are that well written, most of the time it's just suites of songs or song parts loosely connected together, not anything I would consider large forms). Plus it seems to be a neo-prog tradition, a genre I think is terrible.
Let's start the hate.