We're putting a used headset into quarantine for 72 hours. A whole week seems longer than the available advice. We've enough spares to cover.
We've never rented out headsets to passengers, but then we're a Club not a commercial enterprise, looking for marginal income. We consider the provision of headsets and lifejackets to be a part of what Club members pay their membership for. Members with their own aircraft in the hangar are free to borrow both items, too.
TOO