Tomatoes have started their 2nd set of leaves
Usually takes around 2 weeks for the 2nd set of leaves, all depends upon how long I leave the heat mat on
I'll let them grow for a while, then I shut the heat mat/lights off for about 3 weeks to let the stems thicken up & slow the growth
How soon they go into the big greenhouse depends upon the weather & how soon the 7' of snow we have melts