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M4xime
The recommendation for drying plaster walls from old school plasterers is months. I've seen plenty of examples where the paint is only barely stuck to the wall and you can remove the whole thing with a scraper blade because it's painted too soon. It's letting out mositure for a long time as the crystal structure forms.
I don't paint a lot of newly plastered walls but the beading should be ok with emulsion unless it's rusty in which case zinsser bin or cover stain are good options although either of them might cause some change in the surface finish of the emulsion. I generally don't use Bin (the shellac version) because of the meths clean up but cover stain still needs white spirit unless you use the spray can version which is pretty handy.