when they went off to preschool/kingergarten/primary care (outside of family)... was there a transition period? How long did it take for them to get used to their new normal and being with someone else other than family?

DS is starting preschool in the fall (just shy of 3 yo) and we're really excited to get him some structured activity and socialization outside of the comfort of our family/friends circle. But, I know that there will def be a transition period for him to get used to his new normal.

Just wondering how toddlers, older children do adjusting to care outside of the home?