Yeah, 2-4 hours is plenty of time. After it's moist, don't put it in an airtight container as mold is a risk.

Adding a lemon peel will give it a citrus/lemon taste too.

When I used to remoisten my herb, I used to put slices of uncooked potato in with it, and it would moisten an 1/8 up in a matter of a few hours.