How can I get my boyfriend hard, faster?

a finger around his perineum (area between his ball sac and anus) or lube your finger and stick it in him just a bit - will make him rock hard in no time.

Get your boyfriend to learn male multiple orgasm so he doesn't need to recharge. Alexander Allman has a program to teach this. Go here: link

The program is called command and control. I can't get it because I'm under 18, but I've been subscribed to his newsletter for over a year, and gotta say, he's a genius.

BJ's always work well for me paying attention to my balls and the area behind my balls

I hate to break this to you, but 3 or 4 half-hour sessions with a 10-minute reload time is extreme, and not something you're likely to see often. I wouldn't rely on it, take it as it comes (pardon the pun).

my boyfriend likes it when I suck on his head and using both of my hands go in a fluid motion where my hands are going in opposite directions up and down the shaft. it makes him very excited!

There is a place behind their balls that drives them crazy when you touch, lick, or suck that area. When I give him head I like the touch his balls and carress them, then I suck them a little and then I lift them and kiss them from behind that's when I go for the kill and touch and kiss and lick more behind the balls he's almost there before I am! So that's the best I can think that works.