I recently started playing Fallout Shelter, but I go hours without opening the game and collecting resources. When I go back to the game it looks like a little bit of my existing resources have been used, but not by much. However, if I leave the game open, and watch my vault dwellers I can see my resources being used up at a much faster rate. I'm curious if this is explained anywhere. I'm also curious what the rate of resource consumption is while the game is idle vs the rate of consumption while I'm actively playing it.
Fallout – Do the vault dwellers eat more when I watch them
fallout-shelter
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Best Answer
The game has 2 different running in background behaviours:
As an example: A baby requires 3 hours in order to grow up and become an adult. When you open the game again, the game will check if 3 hours have passed since the baby was born to determine whether to make that baby an adult.
Warning: Players tried to fool the game by changing the timer, clock... be aware that this can cause lots of bugs, malfunctions, freezes, crashes etc
TL/DR: Yes, resources will be consumed only when you play the game or for a short while after you stop playing the game.