Typing for a long period of time can be not only tiresome, but it can also increase the risk of serious health problems, such as the carpal tunnel syndrome. One way of preventing this is to configure the system to enforce the typing break. Simply select System → Preferences → Keyboard from the panel, click the Typing Break tab, and select the Lock screen to enforce typing break check box.

To increase or decrease the amount of time you want to be allowed to type before the break is enforced, click the up or down button next to the Work interval lasts label respectively. You can do the same with the Break interval lasts setting to alter the length of the break itself. Finally, select the Allow postponing of breaks check box if you want to be able to delay the break in case you need to finish the work. The changes take effect immediately.

Next time you reach the time limit, you will be presented with a screen advising you to take a break, and a clock displaying the remaining time. If you enabled it, the Postpone Break button will be located at the bottom right corner of the screen.