was over a yead ago but if i remember correctly it seems like a least 24 hours. best to let it sit for as long as you can because there might be bubbles of wet dip under the skin that forms. it may warp the shape or even bust and leak a little dip out. i think that's what happened to the corner in the last picture. even it was dry enough to handle it did tighten a little more over the next couple days.