An awful lot... I'm a completionnist
Even if you put the limit at 500h, I'm probably close to two dozen (all numbered Disgaeas, probably several others RPG, a couple of Animal Crossing, XWing Alliance, Rollercoaster Tycoon, OpenTTD, Tetris ^_^... and that's only the ones I'm sure, for most, without a time counter, I'm lost...)
Over the years (more than 30 of VG, now), I may be close to one hundred games over 200h (3 each year seems doable enough)
At the same time, I'm only playing 10-12 games a year, though. But I'm often REALLY playing them to death.