I shave or have my hair cut every 3 weeks. Unless there's an occasion that I need to attend to and look sharp, that's when I will have my haircut sooner than in 3 weeks. 

I don't shave my hair because I plait it. It's only my beards and my pubic hair that I shave. I usually shave every 5 days for my beards and every week for my pubic. 

I shave once every month, my facial and other hairs doesn't grow fast so I like to let it grow a bit before shaving it off.

For someone like that's very hairy, I can't afford not to shave frequently. I shave my pubic areas once every two days. As for my hair, I don't ever shave it. 

My hair grows very fast, this makes me go for my haircut every 2 weeks. If I don't have my haircut in 2 weeks, I will become very bushy. At least, my barber lives close to me. It's easy for him to come give me home service.