How Long Does Wood Filler Take To Dry. Deeper fills can take as long as six hours before they are fully affixed to the wood. This means your application needs to be fast, so it does not harden before you complete the application.

Along with dry time, the cure time will take additional hours. The best way to determine dry times is to look at guidelines for filler packaging. Wood fillers dry fast and only take 30 minutes to 6 hours to harden.