these are what worked for me:
1. foreplay. it gives time for the blood to circulate down and balloon the little one. you need the blood to keep it lasts and manage it.
2. a story in the mind, of coz not fairy tale la! an erotic story like a soft porn to keep the excitement. again, this gives time for the blood to pack in.
3. regulate and pace the breathing keep the oxygen going. this keeps the blood at where it counts.
4. don't focus on ejaculation but focus on pleasing the partner. it will take some steam off ejaculation but remain sensitive enough to be stimulated continuously.
on average, it helps to keep things going for around 20-30 mins, sometimes longer.
i know not much but at least we both enjoyed!