It depends on what you are looking for.
If you just want the most "Bang for your buck", overnights are probably a bad idea.
If you are looking for an EXPERIENCE.....and one you will likely remember forever, you are much more likely to get that with an overnight than 5x1 hour sessions.
Overnights allow for a wonderful dinner together, great conversation, plenty of flirting, laughter, bantering, teasing and pleasing. Multiple shots, fun in the morning, a relaxed and natural atmosphere for the evening, where nobody is watching the clock.
There is something extraordinary and beautiful about spending a night, a day or a weekend with somebody. It's more authentic, and it will stand out against the plethora of one or two our sessions you normally book. Even if you book 5x1 hour sessions with the same lady, chances are, in 10 years, those will all merge together as a single memory. But an overnight or something different is more likely to create those "Rocking chair on the porch memories".
Longer liaisons allow both people to be more immersed in the moment. You block off a longer period for a special reason, so your mind doesn't jump around to what you need to get done at work, fix at home, pick up etc.
It's a very different feel.....but if you can't appreciate the difference, then it is a waste of time and money.
Regardless of what you choose, remember that this is a fun arena - and one that is supposed to alleviate stress and allow you to feel rejuvenated and amazing! If the financials are causing stress in any way, then it is defeating the purpose. Stay within your discretionary fun budget at all times, and enjoy to the fullest whatever you choose to do!