The pre-k in Dekalb County in the public school is a full day (although they may start like 30 minutes later or get out 30 minutes or so earlier, I can't remember, but definitely not a half day). The private schools we are looking at for pre-k are half day, and ds's preschool is half day (either 8-12 or 9-1). One of the private school offers an extra 2 hours beyond that as well. The ones I have looked at, including public, that have full day have required nap times.
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My daughter does pre-k 9-1 four days a week and 7:50-2pm
one day a week. The one day she is there all day, she comes home
very wound up, even though they have a nap period. For my DD, she does better going half days.
Re: PreK- 4 yr old
DD- 9
DS-6
c/p- April 2016
missed m/c- 6w5d; discovered 8w2d- September 2016
Private pre-k - 9-1, M-F