From the time I had installed it to now im going to say about 6 times. 9pm GMT - 5pm GMT.. Im only rank 7 so that should give you an idea of how long I've been playing. As far as frequency goes the

first time was immediate.
second was about 10mins in
third was about an hour in
fourth was immediate (<--tried new server thought maybe mine was unstable or something)
fifth was about 2 hours in
sixth was maybe 30mins

Times are guessed but, approx. The last time i was in windows mode, the game itself ran alot smoother but I still have the CTD (crash to desktop, its what they are calling it) error.