How many hours to block sand?

Thanks 805, love your slant!

The only outside panel that didn't come with the car is the quarter panels which are after market, and have a little wave to them, I'll take some time and get the worst ripples/ dents out, they are small though. If you've seem my build, I've taken the time to get the metal as straight as possible. Everything is/will be stripped and cleaned, I'm starting from scratch. I'm thinking that primer should go on, and block straight without much of a fight.

lol