If it's for cutting/bulk, then 3 months on/off makes perfect sense. GH is awesome for preserving muscle/strength/muscle fullness and can improve lean gains from a surplus during bulk.
For anti-aging, 2-4 IU to get IGF-1 levels to 250-350 ng/mL. You would want to do this year round.
I would do 5 days on and 2 days off plus run a lower dose. gen. hgh isnt that much really nowadays but buy 3-4 kits forsure to start.you should run at least 5-6 months