"Multiplier Inside Building Privilege": 2.0,
  "Multiplier Outside Building Privilege": 0.5,

Changing these to a higher number makes things despawn slower right?

2 means 2x means slower because 10s x 2 = 20s not 5s. and outside here is 0.5 so 10s * 0.5 = 5s so faster here

Thanks! So the default is 20 seconds?

no it was just an ex idk what the rust default value is.