It would depend on the type of connection you have with the provider. Great sex, awesome. But a longer date session, by which I assume you mean out socially, is much different. Do you have the connection to hold a conversation for two hours before getting back to her place, your place, or a hotel? Are you referring to an overnight session

For me, it honestly just depends. I do prefer a 2 hour date the first time I am meeting someone new, as I like to develop a comfortable, unrushed connection and find this difficult to authentically do in one hour. As for someone I already have a connection with, it is nice to mix things up once in awhile with a longer date, have a few drinks, dinner, and switch things up a bit. This adds a bit of change(and we all know change is ALWAYS a good thing, even if you already have something great with someone) Excitement is always enhanced by anything that is different than the time before.... This can be meeting location, length of the date, new playtime activities, etc....  
I say mix it up whenever possible, especially with anyone seen on a regular basis. Why not several dates one month, a long date the next, a few multiple hour dates the next, etc....  
Xo

For me I prefer long dates, I like to establish a connection with the other person..so an hour doesn't due justice....I am seeing someone right now who I've reconnected with after she disappeared...our dates are always at least 2 hours if not longer....we have great conversation, amazing BCD time and we truly have a connection...I see her twice a month...

Two hours barely covers it for me, since I'm a firm believer in giving pleasure in all kinds of ways has it's own rewards.

Longer dates.

1 hour is always very rushed.

I recently had a date with a provider that included attending a local baseball game and it was the best experience I have had with a provider. She was a doll, very friendly, ad fulfilled a fantasy I have had for a long time. I really enjoyed getting to know her during the game and she really made it feel like a full girlfriend experience. It only made the one on one time that much more intimate and sensual. I think I'm now spoiled and won't do the regular wham bam thank you ma'am, one hour sessions anymore. So, I guess I would go for quality over quantity.

Every once in a while I like a long date, It gives you time just to enjoy each others company. It is often the small things out of the bedroom that provide memorable moments. And when you have enough of them you will smile feel happy and life will be good.  

the short ones in between are nice to take the edge off. But the long ones give the most satisfaction and lasting memories!