Only a few games give you the convenience of making a real-world clock accessible in the game itself. This can be a problem with full-screen games. You don't want them taking up more of your time than you can afford; position a clock of your own close to your screen so that you can keep track of how long you've been playing.
To save some money on your video games, think about subscribing to a service that you can rent games from. The cost of these rental agreements for a year is usually less than the price of two games. You can keep the games until you beat them and just send them back and order another one.
If you have children, be sure their video games are appropriate for their age. You need to check the rating on the front to make sure it's suitable for your kids. Some of these games can promote violence, and this is something you might want to avoid.