My best case scenario would be, having a pretty K-girl to lounge with me around the pool all day, in the nude.  On my current hobby budget, it wouldn't be worth it, however if I won the Lotto, yes! Actually, add another to make it a threesome!  

I don't know why I have never considered that, but have thought of overnights.  I suppose overnights are offered more often than extended daytime appointments.   Both seem about the same except for different downtime options being available.

I think that if you've been with a particular lady more than once and you like her a lot during 1 hour appointments, then 2 hours would be even better.  With that being said, if you can communicate easily with each other and click, spending a day with your chosen lady seems like it would be a very good way to go.