Practice often. If you can practice multiple times a day, GREAT! But I understand that many people work all day… if that is you, even 5 min in the am and 5 min in the pm is better than nothing.
Depending on your dogs attention span, you can work with him for 5 min or 30… or anything in between. The BEST thing tho is to keep it short, so he ends on a successful note.