The working time of ArtResin epoxy resin ( also called the pot life or open time ) is about 45 minutes. This is how long you have to work with the resin before curing sets in and it becomes too stiff to manipulate. You're best to apply the resin as soon as it has been thoroughly mixed for 3 minutes.
TIP: the working time can be affected by heat: if you've put the resin in a warm water bath or if you're working in a warm environment, the working time will be decreased by about 10-15 minutes. The cure time may also be decreased.