I think you are overlooking the point of a long-term engagement.
If you ask some females, myself included, we'll tell you that intercourse is a very small part of the whole experience.
Most gentlemen who book four, five, six+ hours aren't having some sexual marathon, (if so, kudos to the lady for being a trooper).
They are paying for a SERVICE provider. I think that many confuse this with a female also being known as a sexual provider, but in the end, you are paying for a service. This doesn't directly mean sexual services 100% of the time. Sometimes a gentleman truly wants the company of a beautiful lady he has been fantasizing about to an event, rather than going by himself. Maybe he wants to share conversations that he wouldn't neccesarily have with other people in his life. Maybe he truly enjoys taking a female shopping and seeing her smile with the gifts he presents to her.
= A girlfriend experience.
If you are strictly looking for a blow and go or a strictly sexual service for a limited amount of time, you will get that depending on how much time you are willing to set aside.
It may be unnecessary for you for the alternative, because it is not what you desire. The same cannot be said for many other gentlemen.