Not true. I've given head for an hour or more frequently. Youre not just bobbing up and down the whole time, there can be a lot of licking and teasing and hand action in between. If you truly love giving head you want to draw it out and make it last as long as possible. I'd do it longer if he could last that long.
My girlfriend is similar. She'll suck on the head, swirl her tongue around, lick the shaft, get the head slick then rub her fingers over it... A lot of head action doesn't make me cum (cuz it's TOO sensitive) but it does put me in a place of ecstacy I can't even describe. My girl self professes that sucking cock is her favorite things to do, and with how she makes me feel, I can tell. I do feel bad that I haven't cum for her, but I'm still loving every second. And it may not be an hour, but it's a good long time. And to reward her, I'll make her cum a few times by going down on her and fingering her. She's fun because i can make her cum by licking her clit alone.
How can I help her make me cum by sucking my cock though?