You can get a perfectly filled - like glass finish, in a little more than a week in maple, bit longer to a lot longer for walnut of various grades.
If just needing a sealing-grade finish, less than a week using one of the linseed oil finish/varnish's on the market whether tung oil so some
form of finishes like True Oil. Rubbed back with pumice of rotten stone, equals a very nice satin durable finish.