In 2012/2013, the tuition fee for full day kindergarten will be $272/month. There is no fee for half-day kindergarten. So, in theory, you have the option to have your child attend only half days.
However, the curriculum is entirely based around full days, and in 2010/2011 & 2011/2012, as far as I know, there were ZERO families enrolled in half day at Daniel Bagley. Half-day kindergarteners would miss out on lessons, activities, gym/art/library/assemblies, and socialization. My five-year-old (August birthday) was still taking afternoon naps when she started school last fall, so the new schedule was fairly exhausting, but we feel that her integration into the full school experience was far more important than a little bit of lost sleep.
But, if you feel that half day is a better choice for your family, talk to our principal, Ms. Ayer, about your options.
All the pertinent information about full day kindergarten, including SPS' rationale for recommending full-day, how to apply for half-day, and tuition payment, is nicely summarized by SPS here.
The Pay for K link is here. Sign up now to save yourself administrative pain down the road!
Last year's blog post: http://bagleykindergarten.blogspot.com/2011/08/full-day-vs-half-day-kindergarten.html