You can only book the vehicle up to 2 hours in advance under this subscription plan. You can still make advanced bookings beyond 2 hours but it will not be covered under the subscription plan.
E.g. If the time now is 3.45pm, you can make a booking now or 4pm/5pm to be eligible for the subscription plan. Do note that the free 2 hours is applicable on the full hour, you will have to pay for immediate pick-up from 3.45pm - 4pm and your 2 hours in the subscription plan will be from 4 - 6pm.