I'd put it in the oven. Without some heat, full cure time is four to six weeks.
Here is some info I pulled off their site:
DuraCoat Refinishing Notes
Generally you need only wait overnight, or 1 hour if baked at 110 degrees F, to reassemble and fire you weapon. Most abrasive solvents, cleaners, and lubricants can also be used at this point. Full cure time for DuraCoat is four to six weeks.
DuraCoat colors can be mixed with each other to match any color in the Spectrum.
When using multiple colors, such as camouflage patterns, DuraCoat Clear will even out the sheen, or reflection differences between colors, giving your surface an even, finished appearance.
The ideal mixing ratio of DuraCoat to DuraCoat Hardener is 12 parts DuraCoat to 1 part Hardener. You can make your finish glossier or shinier by adding a little more Hardener, up to 10:1. You can make the finish duller, or more matte by using less Hardener, down to 14:1. Any greater or lesser ratio of Hardener may negatively affect durability.
DuraCoat can be applied in a multitude of textures, with dry film thickness from .25 mils to 1.5 mils. You may add more on high-wear areas where tolerance is not an issue. The thicker and heavier you spray, the shinier your finish will become.
To remove any adhesive that remains when you peel off your stencil, user mineral spirits and a clean rag. Mineral spirits will not remove the newly applied DuraCoat, but will dissolve the stencil adhesive.
