I've been turning more prop grenades for people at the Replica Props Forum.
Cut two bodies in that time. Second one I was seeing how much metal I could hog out in one pass -- everything to make the process a little faster. Cut too deep, and fluffed around for a while before I realized the difference between .790 (the aimed for final dimension) and .782 (what I'd accidentally went to) was less than a HUNDREDTH of an inch. Perspective again. Nobody is going to notice that.
And it was a good mistake to make, because while I was fluffing around wondering if it was worth trying to save that one, I set up for the next cuts out of order. And that turns out to be a more streamlined way of making the things in the first place. Even with that delay, the second body took only 45 minutes. Means I probably can get two grenades finished each time I spend the afternoon in the shop.