How long was Phil Connors stuck in "Groundhog Day"?

Since Groundhog Day was Bill's best film according to his career timeline, I figured it would be a nice segue to post a classic. Just how many days did Phil Connors spend stuck in Punxsutawney? Someone took the time to figure it out, and came to the conclusion that it was:

 8 years, 8 months, and 16 days.

Breakdown of how Phil spent his time is below, with commentary at the link above.