It just occurred to me when calling my college roommate that basically, it’s three. With my mom, I let it go all the way to voicemail, as she’s nearly 80 and may be on the other end of the house.
But with most of my friends, if they don’t answer in two rings, it’s a lost cause absent external influences.
depends on the level of importance of the call. I generally do not make calls unless needed though so usuallly right to voicemail but sometimes its kinda not that important and maybe I will hang up after a few rings.