How long should I wait to drill holes into brand new mortar?
The mortar in my closet says to keep wet/moist for 36 hours so it can fully cure. a lot depends on the climate where it's being used so take a look at the directions for your specific mortar. When you do drill, don't use a hammer drill, a regular drill with a mortar/concrete bit is all you'll need. Don't force it, let the drill and bit do their job. Yours should be ready after three days.