I remember pyro giving a rough estimate once in a post that was related to someone complaining about the fact that they made a new plane for the convention but hadn't added any other planes. As usual and as typical, whoever that person was did not think before typing and making a con plane doesn't require the time to make an actual model. Pyro pointed this out and said a con planes takes roughly x and a real plane takes about y hours. I don't remember the actual numbers but you could probably search and find it.
I think it was a con plane, it may have been Santa or the Great Pumpkin or something like that. Can't remember exactly.