I actually managed to wait until today. I slept through a really hot dream, where it felt like I was on the edge for some time. First thing I did after waking up was making sure that I did not accidently cum, luckily I didn't.
I came up with a little game to make cumming more interesting. I start a stopwatch and without seeing the time I have to try and stop it at exactly 30 seconds. If I stop to early or to late I have to to edge for each second I was off and try again.
These were the times that I got: 35, 26, 28, 31 (At around here I really wanted to cum, but getting exactly 30 seconds was harder than I thought), 32, 32, 37 (It's really hard to count when you are so distracted

), 29 (I tried this one without counting, was closer than expected), 33, 27, 37 (I totally forgot how to count), 33 and then I finally got 30 seconds. I had a really nice orgasm, thank you Della

.