I don't know how much the support staff are paid. Presumably they get an annual salary and the MD has to recoup that out of her fee-for-service billing.
I'll try to look up what a similar service would have been billed to the Ontario Health Insurance Plan and post it later today. It's definitely not billed by time, but by service code. Some medical services, like counselling or patient education, are billed by time but the vast majority are not.