Well again, it depends on temps, critters, sun intensity etc etc.. at one day old I'd probably give them a couple of days to a week inside under 24 hrs of CFLs just to get a foothold and a jump start - but I have seen plants sprouted and grown in the ground outside,so..... By transplant I assumed you meant "move to a different pot". Theres not much to transplant after just a day, and the taproot is bound to be super delicate. Can't you put them outside in the containers they are in right now?