When I'm recovering a chain I actually do them by hand - I've had chains written off by taking them to people to get them all returned to the same length and they end up overheating and bluing every other tooth. If you know what you're about and ensure you don't overheat the cutters it's fine but I find no real advantage to doing it by hand with a guided file (Oregon jig thing works quite well). Stuffing the temper can go two ways, either soft cutters which sucks or so hard you can't file the damn things and they need to be ground again early to get them sharp.
Unless a chain is really off spec, can fully sort a 3/8 72 link in about 10-15 minutes. I made a little tensioning doohickey to tighten the chain without the powerhead on the bar - that really helps. I had a ripping chain that clipped something hard that we didn't want, and filed that back to a standard 25deg and that took about 20 minutes to recut and even up the top plates and set the rakers.
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