Well done, that’s great! Learning to edge for longer really does take the experience to a new level. Of course it’s more risky that you’ll go over but I think it’s worth it.
Even if you can’t stay right on that edge, ‘staying in the ‘orgasmic plateau’ as it’s called, the area where you’re aroused enough to cum soon, is wonderful, I encourage everyone to try! Keep going, see if you can make it to ten minutes!