I rarely have to do it anymore, as all my storage is pretty rh stable.
But I still have to do sometimes (gifted cigars, shpo cigars, etc.)
I use an older Fuente box when dry boxing. No idea what the RH in the box is, probably mid 50s?)
Depending on the cigar, anywhere from 8 hours, to a day or two.
I use the old "roll in your fingers and listen" technique to determine if a dry boxing is required.