Has this precious duo never been to a clinic before? The appointment time indicates the time you are eligible to queue with everybody else. You queue to get a get a queue number, then queue some more while waiting for it to be called. When you hear your number, then it's your turn to see the medical professional for the jab. Then, as a precaution against adverse reactions to the vaccine, there's another wait for 30 mins in an observation area before being discharged. The whole process takes slightly more than an hour and a half.
So now we have a pair of loose Karens who have given up their shot at immunity from a global pandemic. There's always gotta be a few.