when to transplant??

when should i transfer my plants outta the little beer cups that they are in now??
suggestions??

when the sprout is about 3/4 inch tall.
also the beer cans should be pots with proper holes????.
roots need air and soil needs drainage and air flowing.

how big should they be before i tranfer to the bigger pots??
they have good drainage now

Let them grow 3 or 4 nodes (Leaf sets) first, then transplant to 3 or 5 gallon pots.

after a wk of growing how big should they be?