The recommended time for using a computer will vary, but there are certain things you should keep in mind. First of all, it does matter what you are using the computer for. Some tasks are not exactly optional, such as if your work requires a computer. Also, your position and how you use your time greatly affect how long you should be on a computer.
First of all, anyone using a computer should take frequent short breaks. You can install a program that reminds you to stretch or stop, or you can simply set a timer. One easy way is to get a clock that tolls the hour. Every hour, get up and stretch. It is very important not to be in one position for long periods of time, especially since the computer can strain both your eyes and your body. To avoid carpel tunnel syndrome or back and neck problems, make sure to pause at least every twenty minutes. The specific length of time of the breaks and interval between breaks varies by your age, physical condition, and the task you are doing at the computer. For example, you are taxing your body differently by reading, using a mouse, or typing.
Exercise is important to keeping your mind and body active. The exercise you do depends on what shape you are in and the repetitive task you are doing, so consult your doctor or a personal trainer. Simple things like stress ball use can keep your hands in shape, and there are chair exercises you can do even when sitting! It is also important to get up and walk around, and rest your eyes. You also might want to use a device to reduce glare, and make sure lighting at your workstation is good. Technical solutions can also help. A wireless mouse added to a laptop can reduce wrist and finger strain, for example.