i recently acquired a lab quality stir plate from my brother-in-law and i've used it for 1 starter so far. with that one, i just used 2 vials of yeast and made a 1L starter, mostly because i didn't know what i was doing. for my next batch, Mr Malty says i can use 2 vials for a 1L or use 1 vial for a 2L. with the 1L starter i made, i just let it go on the stir plate for about 18-20hrs then pitched (worked great). with a 2L, would i just put the whole 2L on the stir plate for 18-24hrs, or would i need to do 1 day at 1L and another day at 2L to step it up? what's the difference in doing a 1L vs 2L starter? thanks!