I use a TowerPro sg90.
1.5 ms for the centre position 0 degree, and 2 ms pulse for +90 degree and -90 degree with a 1ms pulse.
But it's definitely not looking like it goes for 90 degree or -90 degree.
I did read, some said "I tested two of them for about 130.000 cycles, without load, at one cyle per second, and 70 degrees travel." .
What does that mean "130.000 cycles at one cycle per second"?