A couple days at most, and thats just for spreading.
Most pastes dont have a cure time these days (and most pastes worth buying shouldnt have one, pastes like AS5 are behind the curve, and easily beaten by pastes like MX-4)
There's really no need to burn in the CPU. With normal use, the paste will flow and spread. It may take several days before the temps finally stabilize at their lowest point.
A couple days at most, and thats just for spreading.
Most pastes dont have a cure time these days (and most pastes worth buying shouldnt have one, pastes like AS5 are behind the curve, and easily beaten by pastes like MX-4)