privatemdlabs does hgh serum tests check the website. by twice the duration I mean twice the time, 6month min is standard. a lot of people run hgh with other compounds to run synergistically, I would bet that running a test cycle in the middle of that 6 months would yield good results, lots of people run t4 and igf1 with hgh as well. standard hgh dose varies in opinion and also on what hgh. If you have legit pharma growth it can be 4iu/day, if you have not so great chinese generics it could be 10-15iu/day who knows really... Doing a serum test will tell you if it's real or not and generally the potency. generics will test around 20, pharma should be double that or so.
having said all of that ^ this is all regurgitated info from forums, the best thing you can do is either nail down a legit straight from pharmacy or buy and serum test some stuff for yourself.