How Tall Do You Let Seedlings Get Before X-plant To Pots From Tray Cells ?

I've never had more than a few seeds at a time. Mostly I have ordered three to five seeds at a time. I start them in a small pot and watch them like a hawk. This spring, I got a male plant and decided that I could stop buying seeds. I put the pollen in a bag and put the bud branch in the bag and shook it around. I must have made a couple hundred seeds. The male plant was from a Northern Ninja. I tried to just pollenate one bud from each of my plants, but nature finds a way and every bud had some seeds.
Anyhow, I have a tray and out of fifty I planted last week, I have thirtynine that popped. Is there a certain height I should transplant them? I have so many that are already over two inches. I planted them Monday night. Should I just transplant the ones that are already tall and cull the short ones and the ones that seem to take longer to pop? I'm really just trying to get some new genetics for mothers to clone next month.

Transplanting these is going to be a challenge. There are not enough roots at this stage to hold the soil together.......meanwhile they're stretching to a dangerous height without some support. Lower your light to stop some of the stretch. If and when you transplant, bury most of the stem. Next time consider either rapid rooters or starting in soil in a solo cup.
Good luck.

Thank you for the reply. I'll repot them tomorrow. I've never had problems transplanting. I sprinkle some rooting agent on the roots and put them in the new pots. I cannot remember ever having any shock from transplanting. I will definitely bury them up close to the leaves.