Vector drawing of cruise ship

I stumbled across this link to a tutorial for a vector cruise ship drawing done in Adobe Illustrator. It says it took 720 hours to complete, and that it needed to be done in under 2 months. Assuming 8-hour days (5 days/week), this would have taken 90 days (3 months). Increasing to 10-hour days, it still would have taken 72 days. In order to get it done in 60 days, the artist was likely pulling 12-hour days to finish in time.

It's not that I'm not a hard worker, but I can't imagine staring at my screen at the same illustration for that long. A spectacular illustration nonetheless.