Yep, I agree - very tough question.
30 x $25 p/h (too cheap) = $750.00
30 x $50 p/h (reasonable) = $1500.00
I'm guessing on a machine which would have cost possibly $1500 to $2500, adds up quick.
I guess its tough for some as they might not know / appreciate how much work actually goes into a full rebuild.
Eitherway the owner has got himself a much better machine than what came through the door.