This depends on the ambient temperature of the air, how hot the FixIts is, and how thick / thin the FixIts is. FixIts cools from the outside in so you can speed up the cooling process by running your formed shape under a cold tap or slow down the cooling process by continuously exposing or intermittently exposing to heat (by using hot air or dunking into hot water for example).At room temperature we find that you usually have a couple of minutes to work with FixIts. Remember that the outside cools down before the inside, so you may have to leave thicker pieces a bit longer to fully cool down inside. Please note: FixIts shrinks by about 1% between it's fully molten state and fully solid state. So when using for mechanical purposes, such as on a screw thread, allow FixIts to fully cool before manipulating it.