For each classic car for hire (chauffeured rental), you will see the hourly rental rate. One thing to keep in mind is that this rate is calculated from the moment the vehicle leaves the owner’s garage until it returns there.
Most listings have a minimum of 2 hours (a few have 3 hours), even if the job takes less time than that. The main reason for this is that it takes the owner the same amount of time to prepare the vehicle no matter how long it is used for.