Well that's just under four hours a day. If you can find a school which has that kind of availability of aircraft then why not? Might want to spread it out over the day though. You could always plan to do a cross-country journey each day to a different airfield which is roughly 2 hours away from your base field; make a day trip of it.
As for how much flying you can comfortably do in a day, think about full-time flight instructors who probably spend on average 7-8 hours a day in the air...4 hours isn't going to be a problem! I would say take into account bad weather causing cancellations but you said you were looking in Florida and so that shouldn't really be a problem ..... unless you go during hurricane season
