Service Rates VIRTUAL ASSISTANT SERVICES: Charges on retainer are $450 per month and include 10 hours of time. Any overages will be billed at $45 per hour. *10 hours a month is average. 5 hour minimum per month. *Any unused hours will not be credited toward the next month. *Does not include cost of supplies or items/services purchased. Any items purchased for client will be included on the next invoice.