I would recommend (I'm just a vet tech in training so take it for what it's worth and no more xD) giving Max his next tablet sometime in the morning. Usually twice a day means every twelve hrs. Even though you missed this morning, I suggest continuing to give the pills as if you didn't miss. So, once in the am and once at night. Or with breakfast then dinner.
Mom To~ Dakoda (b/t GSD), Acheron (black GSD)