I run Puppy 99.9% of the time, although that includes a fair amount of Wine use for (mainly) the old Google SketchUP (not the newer Trimble versions).
I very occasionally find that I can't get Wine working for odball Windows engineering programs, and will dual boot into Win 7 (disconnected from wifi) to run it....... usually just long enough to generate some needed output file. Then go back to Puppy to work with it.
If I could do everything I need in a Linux (or Wine compatible) version, I'd wipe Windows as fast as I've wiped ChromeOS off my Crumbbook.
To put a number on it, I might dip into Win7 maybe once every month or two for a few minutes. I'm running Puppy 300 hours a month, easy.