Mulch-Lock® is specially formulated to last a long time. It can last up to 12 months, but the exact amount of time really depends on the application. There are three factors that determine how long it holds: weight and size of ground cover, how heavily Mulch-Lock® is applied, and how long Mulch-Lock® is left to cure.
Mulch-Lock® takes up to 48 hours to completely cure as long as it's not diluted by rain water or a sprinkler system right after it's applied. Double coating trouble spots (downspouts, driveways, and sloped areas) will also help those areas hold in place longer.