A Guarneri violin - finished and waiting for set up.
I generally let the varnish dry for about a month before fitting sounpost and bridge etc.
Fitting up involves a good deal of handling and is easier if the varnish is that bit tougher. My oil varnish is formulated to be
a little tougher than most in the early stages of drying. These varnishes do not really harden up for a year or two.