Well if it's 4 hours, we shouldn't need much in the way of "breaks" really. Maybe once an hour take 5 for biological functions?
Obviously most people would want it to occur away from dinnertime specifically, so the most logical time slots available would either be something like 12-4pm, or 7-11pm. I'm sure people can volunteer others, but just figuring something along those lines would accommodate most people with typical patterns. I wouldn't mind something that ended up running through normal dinner hours, I'm just anticipating other people objecting to it.
