Replying to What constitutes a ski day?

i have been in long and often times heated debates about what constitutes a ski day.  I have one friend who is a race coach that figures if he straps on his boards for a setting of the course run and that is it then he has successfully skied and marks it down.  Others say such things as a minimum of 5 runs, or 10 runs or some other arbitrary though usually whole number (never heard a 7.5 runs counts).
I consider any time a ski a run, whether it be in my back yard on the rail set-up, down some hills in an urban decent adventure or at the actual mountain.  Rail jams sure as hell are ski days in my books even if it is just a little in-run and landing pad.  it is still ski oriented and takes a lot of work (especially during the 45 minutes jams).

what do you consider to be a ski day?  when do you mark one down?