I can't count the times I have had modern, good quality (Longines, Tag, Oris, etc) automatics sent to me because they aren't performing well. I put them on my watch winder, totally unwound, leave them for 8 to 12 hours, take them off the watch winder, and do a static test to see how long they run. Almost invariably they run for about 40 hours. This indicates to me the watch is being worn by someone who has probably only, ever, had Quartz watches, and have no idea that automatics have to be worn in order that they can wind themselves. I return the watch with instructions describing the necessary wearing information, and how mechanical watches differ from quartz, and that usually solves the problem.
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