Seven Months
I've had my 9860 for seven months. I'm supposed to get it back on Wednesday after sending it in for repairs for the third time and replacing some components myself. This time it's a whole new machine except for the display. So, I guess, since I've sent it in three times, I've had it for something over 5 months.
Next time, if I buy a Sager (=> D900K), I'm planning on researching and purchasing an on-site warranty. That likely would have cost me less than all of the shipping costs I've incurred.