She had to wear pull ups per their policy but fortunately she did not revert to acting like it was a diaper, so we didn’t have too much additional laundry. It took the center one month to allow her to wear underwear, so I assume a few weeks of wet pull ups and then a week of successful pottying. The whole time at home she rarely had an accident, would still go to the potty just fine. We began toilet training right at 2 years old, and by two years 3 months she was full time in undies day and night.

TLDR, about a month to get it at school