Well, I'd like to think of Linux as my primary, but over the past six months, I've spent about 10 hours on Linux, whereas I'm on Windows most of the day, 6 days a week. I probably spend on average half an hour a day on Putty to a unix-based box, but the rest is in Windows. The Linux box is my main machine, but I've been working out-of-town so I've been using the work laptop far more than my home desktop.