I recommend marinating lamb chops for 4 to 5 hours for the best results. 30 minutes will do in a pinch or you can leave the chops in the marinade overnight if you prefer to get a head start on this recipe. However, because this lamb marinate contains lemon juice, the acidity will actually start to "cook" your lamb if it's left to marinate too long. For that reason, I don't recommend marinating for longer than 24 hours.