No harm at all as the hand is disengaged from the mechanism and can happily sit there for eternity. I've had mine at the 7 seconds mark for almost 10 years now and every watch I send out has it at that point, as well as every watch picture on my website.
I wish the right hand pic below had been in focus as it has my trident seconds hand at exactly the same angle that neptune has been holding his trident at the very epicentre of 'the empire' since 1411. Poor focus was due to a bit too much vino plonko at dinner last night.