Hi,
As I understand, the best solution for you would be to select some time range (8:30 Monday - 8.30 Next Monday) and just repeat it. Unfortunately for now it's impossible.
The workaround exists, but the solution is neither obvious nor simple.You can review it below and decide for yourself whether it'd easier for you to use the proposed one or stick to already used .
You'll need to create four appointments for each employee, but created once you won't need to repeat it every 9 week.