How long does it take for playdough to harden?
three days
Play-Doh does not have an expiration date. Alternatively, the Hasbro website recommends wrapping the Play-Doh compound in a damp paper towel and leaving it overnight in a closed container. If left to dry completely, the compound hardens, and it may not be usable again.
Beside this, Can you air dry Play Doh?
Can you air dry Play Doh? I have found that it’s easy to dry out your play doh sculpture, by simply leaving it in the open air to cure, but you may run into problems with the piece looking “ashy” when it dries.