I don’t teach Kindergarten now but did my student teaching in kindergarten. I would suggest very short, very active lessons for kindergartners. atozteacherstuff.com has a lot of good information. Good luck!
I teach kindergarten. However, you will need to plan most of this with your cooperating teacher. Regardless of how you feel/what you know you will need to follow their lead. —On average, I try not to keep an activity going for more than 10-15 minutes unless the students are moving in some way.