A few patches ago a new calculation for offline time has been added, that might be confusing since not everything is affected by it and some only over a period of time and other have a set cap on them (God Crystal, Maybe BH?).
Rested Bonus Edit
This Bonus can be build up to last 3 hours after a offline period of 9 hours. Up to that point you get 1/3rd of your offline time as rested bonus.