Waiting in Fallout 4 allows the player character to advance time in the game world, which can be useful for a variety of reasons. For example, waiting can be used to skip past nighttime, when it is more difficult to see and navigate. Additionally, waiting can be used to advance time to a specific point in the day, such as when a quest becomes available or when a store opens.
To wait in Fallout 4, the player simply needs to open the Pip-Boy menu and select the “Wait” option. The player can then choose how many hours they want to wait, up to a maximum of 24 hours. Once the player has selected the desired amount of time, they simply need to press the “Wait” button and the game world will advance accordingly.