How many hours is 1PM to 3PM?

If my calculations are right which they are there are two hours from 1:00 p.m. to 3:00 p.m. there's 60 Minutes in 1 hour so from 1:00 p.m. to 2:00 p.m. is 1 hour and from 2:00 p.m. to 3:00 p.m. that's another hour and if we add those together that gives us our total of 2 hours meaning that there is indeed 2 hours 1:00 to 3:00 p.m..