3 weeks in. Fan leaves the size of my hand. Topped today. How long until 2nd topping?

I would say , let them cool down from stress, give like a week. After you can repot them, you'll have to do it sooner or later, unless you don't need big plants, but then you don't need toping too. After repoting cooling down, again give 5-7 days and you can top again some shoots. I usually don't do any training for last week before fliping to flower. Happy Growing !