2-3 weeks is typical for PCT... something like
week "x") 2/day (if you can handle 3 this would look a little different but you get the idea... 3/day of erase caused serious joint pain for me)
week "x+1") 1/day
week "x+2") 1 eod (every other day)
That said, for what you're doing, you could probably collapse this down to 3 days instead of a week...
Anyhow, with the I3C go with 400mg/day for as long as you feel like... the vitacost dot com stuff is pretty damn cheep; you can get like a 2 month supply at that dosage for < $20.
That all said, unless you're hormonal environment is unbalanced, for your typical "NHA" (non-hormonal anabolic) cycle, this is all overkill. But it shouldn't hurt much beyond the negative effect on lipids that an AI will have... and your wallet.