A year for one painting?

A while ago I talked about people who create a painting every day. I recently bought a DVD called The Treasures of Long Gone John, which shows a time-lapse video of Todd Schorr painting A Pirate's Treasure Dream. It took him almost a full year to do it.
Can you imagine?? I don't know if I'd be able to do it. My paintings take about 15 hours of painting time each to do. Any more than that, and it starts to seem like too big of an "investment" for one painting. Maybe someday I'll do a larger-time-period painting - who knows.