How long to dry?

Assuming warm/dry conditions (70 F. / < 50% RH and dry surfaces), application up to ¼" should be allowed to dry for approximately 6 hours to a hard consistency. For thickness greater than ¼", apply in multiple coats allowing each coat to dry completely between application. The maximum application depth for this product is ¾".

Drying time depends on how thick you use it, but if not using overly thick it dries quite fast. When I used it to fill in gaps on a board floor it was dried in one spot before I got to the next area. It works really well. I did still let it sit overnight before I had the carpet installed over it.