im not sure if anybody actually knows the answer to your question. there also may not be a clear cut answer anyways. it's also and issue that i consider minutiae.
wrt PWO, consume a good meal or shake prior to lifting. during and after are cool too, but the 'window or opportunity' or whatever made up stuff will be seized by a preworkout meal or such.
other than that, growth is a combination of added resistance (getting stronger) and calorice surplus (with a non-stupid macro ratio, of course) over time.
espousing the fitness/fatigue model, growth can occur days, weeks, maybe even months (in the most extreme cases) after the lifting stimulus. gradually lifting and eating more is the answer to growth.
anyways, what sasquatch said is right. dont worry about it.