How Long Does Wood Filler Take To Dry. Wood fillers dry fast and only take 30 minutes to 6 hours to harden. Deeper fills can take as long as six hours before they are fully affixed to the wood.
Along with dry time, the cure time will take additional hours. Shallow repairs involving wood filler will only take 15 minutes to two hours to dry in most cases. Deeper fills can take as long as six hours before they are fully affixed to the wood.