Just had a week off, and spend most of it in the shop, milling up some (a lot) of reclaimed oak for cabinets. I find, that at about 7-8 hours, my feet/legs are killing me. Wearing sneakers. Concrete slab, floor coverings aren't an option as I need to wheel things around my shop frequently, as well as clean the floor, and I do more than woodworking in there (keep the beater running, e.g). For those of you that do this for a living, what's the magic shoe? I feel like I should be able to go 9-11 hours. Bear in mind, this is not 9 hours at a time. I take many breaks, LOL!