In such cases where you are not occupying the limousine during your rental (such as bar-hopping, dinner reservations, concerts, sporting events, etc.) you still have to pay for the rental time, even though you aren’t physically inside the vehicle. Even though you are not using the vehicle while at a concert, the vehicle cannot be used elsewhere; even when there are 2 or 3 hours in between drop-off and pickup.
In addition, if there are more than 6-7 hours between drop-off and pick-up and you remain local, some companies may offer a “split” – just a rental to-and-from your destination with no charge for waiting time in between, however this option offers inconveniences such as unavailability to leave things in the limo, leaving earlier than expected, or having the same chauffeur or car upon return. Ask your service provider if they offer a package to accommodate your needs.