If you don't degree in a saw, and just pull it apart you can get a lot done in a hour or two. I probably don't have much over 2 hours in the porting and muffler mod on the 576. which it's 2 port transfers and the intake and exhaust can't be widened much at all. It takes about as long for the cylinder and muffler to dry out after I wash them out than it does for me to port the cylinder. I know of a shop that will port saws for $200.