Under SU5 I had a few crashes when quittng out from the sims main menu. There was no visible indicator of this, but it seemed to close very fast, and when I checked the Event Viewer I had the familiar 0xc0000005 error.
I’ve had three crashes with SU6 so far, all have been either on the main menu somewhere, two of which were importing an LNM plan a second time.
I’ve not had a crash with SU6 either during, or when ending a flight, at least not yet! 
As a total guess I would say I’ve clocked up maybe ~50 hours since SU6 was released.