Submitted by immeas, also found by eccentricexit, ayeslick, 0xBeirao, Nyx, chaduke, and fyvgsk
The quitPeriod is supposed to give users time to rage quit if there are changes they dont agree with. The quit period is limited to be within 1 day and a week and can only be changed by owner:
However the change can be done instantly. An owner can propose a change, users will expect to wait three days for it to be applied, and after one day change the quitPeriod to 1 day and apply the changes.
Changes to fees and adapters can happen faster than users expect not giving them time enough to react.
Small PoC in Vault.t.sol:
VS Code, Forge
Either lock quitPeriod changes for the old quitPeriod.
Or apply the duration when the change is proposed:
Same applies for changeAdapter.
RedVeil (Popcorn) confirmed 
