I truly enjoy the act, especially surprising her during foreplay and giving extended oral, several orgasms. A woman always appreciates being worshipped sometimes.
Every girl/woman who has sex with me knows how sincere I am in giving her satisfactory oral sex, orgasms guaranteed. I used to promise a girl on a first date that i would go down on her for as long as she wanted and then I would take her home if she would come back the next night and fuck me. Sometimes I got laid that night, but the others always came back for more.
To give her deserved pleasure, there can be no time limit - she may be exceptionally eager to come and it could be over with in 15 or 30 minutes. But two hours gives me enough time to switch from me giving or to her giving me or (not to completion), and then switching again but until she is ready to come. Multiples if at all possible, so I tend to be careful not to chew on her clit.
I had a thing for my French teacher in high school and I tried hitting on her in my senior year several times. She was single, never married, very quiet outside the classroom so I figured she might be gay. But had she allowed it, I would have been her oral slave until I went to college and that was when society would not have put her in jail. I wouldn't have told anybody anyway, not even my close friends. I just wanted to get my head between her sexy legs.
It gives me tremendous gratification to satisfy a girl/woman orally, i.e. giving her orgasms and I will forego reciprocation or additional sex to convince her that I can be patient and accommodating. However, 69 is the ideal oral experience for me, to see who can last the longest or who can make their partner want to come first. It does not matter to me if she swallows or not as long as she enjoys what she does.