so when does the big explosion of bud start

i`am 3 weeks into flower and i have a indica dominant plant that has some bud on it and i have 2 sativa dominant plants that have stretched dureing this time so when does the big explosion of bud happen.

Last two weeks are critical, they put on the majority of their weight then.

for indica it ca be around the 45-60 day mark, sativa can be a little to a lot longer. But remember every strain is different. And the size of your light