Comment by Ancapistani

It's not hard to make the adjustment, but you need a timegrapher to measure the results in a reasonable time.

I've adjusted a couple of my watches over the course of a week or two by making small adjustments, noting the time, wearing it for a day, and then noting how much the time had changed versus a "known good" time. It's a pain but doable.

There are mobile apps that use the phone's microphone to measure the watch's "ticks" and graph them for you. They aren't anywhere near as accurate as a "real" timegrapher but they'll get you close enough.

At one point I had about a dozen mechanical watches. These days I have three, and only one that I wear almost exclusively. It's a Maratac Mid-Pilot, which uses a Miyota 8245 movement. I've used the "adjust and check later" method to adjust it, and it loses about 10s per week - well within the acceptable range.

The other two that I've kept are a Seagull 1963, which I wear as a "dress watch", and a Vostok Retro 1934, which I sometimes wear when I want a change of pace. It has a white face and I have a variety of brightly-colored straps for it.

One day I'll step up and buy a Hamilton, but I'm still savoring the serotonin from looking at them and anticipating :).