How long can you hold the space bar?
Space bar eight seconds. May vary depending on your version of Windows or some distinctive keyboard driver. Able to go back to before when I held down the space bar for eight seconds.
What happens if you press a key for too long?
In practice, the actual amount of current being drawn by each key switch may prove too much for the keyboard controller and it will get confused. On a keyboard that has limited roll-over, the controller will get confused even more quickly and can send signals for keys that have not yet been pressed.
What is the purpose of a spacebar count?
Its main purpose is to conveniently enter a space, e.g., between words during typing. A typical space bar key is very large, enough so that a thumb from either hand can use it, and is almost always found on the bottom row of standard keyboard layouts
