From Runic Games Wiki
The Time Control window is used to control the current time of day and time multiplier in the editor. It is only used as a preview and does not affect the time settings in the game.
- Time Slider
- This slider adjusts the current time of day.
- Time Multiplier
- This value specifies the speed multiplier for time of day.
- 0 will stop time.
- 1 is the default speed.