has anyone run a test cycle for over 20 weeks.........is that bad?

I know someone who ran the sus 15 weeks at 500mg per week, (this is also the cylce I am on now)

but he then ran another 11 weeks at 750mg........I thought that was way to much, he said nothing bad happened to him, and he did get huge off it. Im not considering it but more curious as to how good bad, or doesnt matter that is.

He is training for bodybuilding and has a personal trainer who gets him the stuff and told him to do that. I dont know if that info helps at all.