I taught full day K for 17 of the past 22 years. That is all my district offers. However, both of my children attended half-day K in our home district. Families can lottery into full day K but I chose half day for them.
When my older son was in K, the teacher leaned heavily on the parents to do extra practice at home. I can't remember their daily schedule exactly but they did not go out to recess every day and the only "special" class they had was music once a week. I don't know how or if she fit everything in, but the majority of the students had great readiness skills and the expectations for end-of-year performance were a bit lower than my district.
My younger son did kindergarten online during the pandemic. He had a RIDICULOUS amount of work. He was on the computer for well more than half the day every day. I actually emailed someone at the district level about it, explaining that I had enrolled him in half day K. They explained that there was no difference in curriculum in full and half day and the other half of the full day K was used for lunch, recess, and special classes. As a K teacher, I simply don't believe that's true. Those things don't take another 2 1/2 hours, even with transitions. But they insisted that full day and half day students get the same amount of instructional time in the core subjects.
All that to say, I have absolutely no idea how you do that!