Wouldn’t it be more likely they’d infer he was a doctor? I wouldn’t expect patients to go every day for 8 hours. (Not saying either is “ok”, but guessing patient from those facts is particularly poor I think)
As an example, suppose a cell phone appears at the local supermarket/grocery store every weekday from 9 AM to 5 PM. If you conclude that phone is owned by an extremely avid supermarket shopper rather than a store manager, you're ignoring the persistence over time dimension.
If you claim that it's more likely a cashier rather than a store manager (because there are more cashiers than managers), you're on much firmer ground than if you claim it's more likely a shopper than a store manager just because there are wildly more shoppers than managers.