Couple days. Of course this is dependent on the starting point. (on cycle, PCT, or "Other")
I think it has more to do with semen levels then you balls getting bigger. Of course though, the heavier they are, the harder the fall.
The first time I used LR3 I noticed a very noticable difference in PCT. BOys bounced RIGHT back. Now, whether they were fully productive is questionable.
If your looking for something perminate, IGF wont do it.
GH secreation regulated LH pulses. I can assume (no proof on hand) that in some way IGF-1 contributes somewhere along the way, and LR3 may give the same signals. So, this may induce spermogenisis, and make your boys bigger.
I could be mistaken. But, if nothing else, Imn my expirence, (more the first time then the next though) it did make my boys a little larger.