Varies with the game
Lately I have been playing double deck, I use a count system called HiLo, except I count deuces and sevens as +1/2. I also side count aces, and add those into the count for insurance, or subtract out for many playing variations. I use 40 some playing variations based on the count. I have been spreading $25 to $250 without any attention from the pit, and have been consistently averaging $75 an hour. Of course, some of this return is due to poor card handling and shuffle procedures by the casino. For several years, I played 50-60 hours per week, but for the past two years, my present situation doesn't allow me the time to get as many hours in at the tables, and I have to content myself with monthly trips to local casinos, and 3-4 trips to Vegas a year.