To be honest, its not super super suppressive but it is suppressive. So yes, I always suggest a solid PCT for anyone.
2-3 months minimum is what I administered when working in the med field. Even Clomid at 25mgs ED and then an anti estrogen alongside it, even nolva or say arim works like a charm.
We saw most mens HPTA returned in 2-12 months. and the big factor was age and cycle history. So a young guy with no cycle history bounced back super quick. A 35-50 year old man with several cycles or more under his belt might take a full 6-12 months to recover and even then, once you cycle, your HPTA is rarely ever back to normal.
So say your baseline is a 600. When u come off your PCT, say clomid, etc. You might only go back as high as 500 n/dl naturally.
Its one of the big takeaways that people wont tell you much about.
You can stay on Clomid long term. I have a client now that was 400n/dL natural, never touched an anabolic in his life. We put him on 25mgs of clomid ED and 6 months later, he regularly tests out at 1100n/dL as hard as that is to believe.