No matter how long, I can't climax from a blowjob

Question: 

As the title says, I have a lot of trouble climaxing from a blowjob. I've always wanted to, but it never happens. I can easily climax from intercourse and masturbation, but never from a blowjob.

I'm totally into it, it feels amazing, but I can never get to that point.

I've tried asking my girlfriend to try different things and they seem work, but I never make it to the end. I've gone for 10 mins, 20 mins, even a half hour and by then it's just raw.

I'm not sure if it's the way she's doing it, or if it's something on my end.

Anyone else have this issue or any tips?

Answer: 

i have the same it takes like 40 minutes to an hour, if she hasn't sucked on your balls yet try that it really helps. you might cum excessively hard if you do end up cumming though, and by that i mean be aware of your surroundings your cum might shoot across the room. i was once laying down getting a Blow J and it straight up hit the ceiling when i finally came.

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