Most visitors online was 1660 , on 12 Dec 2020
Agreed, overnight won't harm anything. I sometimes do it as a test to check for anything bent; it's useful for discerning any lack of power through the train, and checking EW & verge problems.Faster impulsing, no doubt, but with near zero impact from weight I wouldn't think it would have a huge affect in the short term. If you let it run that way for a month, maybe ..... but overnight I don't see an issue.
For timing purposes, it shortens the "hours" by a bunch and hurries things along when counting BPH. It also speeds up the 'break in' period some clocks need after bushing work. Otherwise, there's not many reasons to do itVer,
It would have to run for a long time to do any damage. Actually there could be less contact forces without a pendulum in play. But ... I can't think of any reason why anyone would want to run a clock without a pendulum. Most people find the clacking noise very annoying.
I think Mike is "on the wrong side of fifty" chronologically (as I am too).I always do that. If you run it for 50 years like that it might need some bushing.