The timer that comes with the Scattergories game is by default set at three minutes. Additionally, the time has settings for 2.5 and 2 minutes.
The basic game rules for Scattergories state that the timer should be set to the longest setting, which is three minutes. A time-challenge game is one of the suggested game modifications in the official rulebook. Players in the time challenge can shorten the time allotted and increase the relative complexity of the game by changing the timer to one of the other two levels. By turning a knob to the desired setting, players set the timer.