Berra, Panel lines and rivets on their own took abour 10 hours so far, there's still a few to go in. Another 8 hours for research, 4 hours for the paint and markings and 6 hours so far for the dirt/weathering and panel highlights.
Looking at about 40 hours total for the pair. I work fairly slowly, I've wanted to teach myself a decent graphics package for a while and this has given me a project that I can sink my teeth into. To be honest I've kind of suprised myself with how good it looks.
Gatso