Some do twice a week split and some do it all in one shot. sust was made for a once a week injection so patience don't have to pin so often. Either way it all will work. My buddy does it twice a week and I ran it once a week and saw no difference between the two. Once a week injections will give you more stable blood levels.
I'm on 125mg test e trt. I think what I will do is 500mg sust in one shot per week,and keep running the test e on a different day. That's 625mg total per week. Will run for 12 weeks. Last 3 cycles I have run other compounds with test,and I sort of miss the feeling of being on a cycle of just test. Will run small dose of letro to keep down estro sides and water retention