What is the rule of thumb regarding "when to walk away"?

What is the rule of thumb regarding "when to walk away"?

Frank Scoblete (Casino Gambling Expert & Bestselling Author) gives expert video advice on: Which casino games represent the best odds for a player?; What is the rule of thumb regarding "when to walk away"? and more...

Players are always saying to themselves and to others, when should I leave the game, walk away? Should I leave when I've just won? Should I leave after an hour? Well, here's a very simple rule of thumb for when to walk away. If you are the average casino player, and you find that you're ahead by a certain amount, and you think to yourself, I wonder if I should walk away? Well, walk away, because as soon as you had that thought, you knew you should leave. However, if you're an advantage player and you have an advantage over the house, walk away when you get tired, because when you're tired you lose your edge.