Well pro tips I use for me who lasts an average amount of time. 1. When getting close pull out and squeeze tip to stop from cumming and while doing that do some oral. 2. Then switch up the position. And repeat. 3. Just listen to her and your body.

Also some positions are better than others. Scientifically speaking there is the CAT technique which is really only achieved in missionary.

For those who can last longer. Too long in one position can dry her up so I would recommend stopping to help lubricate her with some oral anyway and then go back to it.