We're a larger firm and with a total 6 assistant and 1 receptionist. We take 1 hour shifts with the max of 2 hours. We assign 1 person to be the backup for the whole day. Meaning if I'm at the desk for 2 hours and need a potty break, then the backup assigned will come up the desk while I run to the ladies room.
Our receptionist also delivers, sets up and cleans up beverages from each conference room. Her "backup" is assigned to her for 2 weeks. The point of the backup is to cover the phones while the receptionist makes coffee, takes beverages to a conference or cleans up. The backup also covers the phones for potty breaks and the receptionist lunch hour. It works out really well for us.
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Bridget

Wife to Eduardo (12/4/99), Mommy to Aaron (10/26/01)