koo.. I've always split it.. but i shoot in my shoulder and rear delt.. gets kinda sore twice a week.. If once a weeks better I'd rather jump on that..
Half life is about 10.5 days so, Im thinking once a week is okay too..
Once a week is not "gold". Once a week is wrong. You may "get away with it" but it's a bad idea.
You'll have your blood levels going up and down from week to week. You need to shoot Test E every 4 or every 5 days to avoid roller coastering your test levels. Which by the way is a good way to increase your chances of side effects.