I'd say an overnight test (around 8 hours) is enough. Do this for Memtest86+ and Prime95/OCCT/Intel Burn. Contrary to some opinions I've seen, playing a game

I'd say an overnight test (around 8 hours) is enough. Do this for Memtest86+ and Prime95/OCCT/Intel Burn. Contrary to some opinions I've seen, playing a game for a while is not a sufficient test for overclock stability.