Honestly dude, there is plenty of literature on the topic, all of which I don’t read. It’s all about the foreplay, in my opinion. Make her cum 8 times from eating and fingering her relentlessly, and she won’t care how long you last. Neither will you.
Eat her, and when she cums, just keep on going, and when she cums again, keep on going, repeat, then repeat, then repeat. Then switch and do the same when you finger her. Your dick, even if just for 5 to 10 minutes, will feel like a supercharged cock after her that many orgasms have flooded her. How long you last will be irrelevant. She will likely orgasm once or twice pretty quick and your care will cease to be on timing, but more on the number of times she came.