That's a kind of timekeeping I'm just not going to worry about, and it's not what PT is suggesting.Whittling a wooden wand or painting a weapon sheathe on the back of a slow cart doesn't see unrealistic.
Now at some point you'd have to finish up the process at a town, barracks, or campsite. Id rule that.
But for 1 hour of a 24 hour process, not too bad.
If you imagine crafting magic items is the same as whittling, you do you.