T recovery after ADT seems to be extremely variable. At age 58, my 3 year tour finished up around March 2016.
My baseline T was 404 ng/dl. During ADT2, it varied but stayed below 10-15 ng/dl. After the ADT2 "released" in March 2016 (was on "4 month" Lupron shots), this happened:
2 months: 132 ng/ml
5 months: 290 ("normal")
9 months: 350
12 months: 544 (!)
18 months: 709 (!!)
I'm was quite pleased with this. Oddly, I still get a couple hot flashes a day, one or two at night. Struggling to lose the weight I gained, too.
Here's a link to a 2014 thread here on Healingwell on this topic:Time interval for recovery of testosterone after Lupron therapy
[Edit: added detailed T recovery pattern]