Male hanger + Two working sets of 7 minutes?

Hink recommends for pumping that we do 1 warm up set (which I skip) and then 3 working sets of 5-7 minutes. I’m just looking for confirmation doing 2 sets instead of 7 minutes can still lead to good growth? since it’s only a minute less total pump time compared to if I did 3 sets of 5 minutes.

BTW right before pumping I use a male hanger for 20/30 minutes