Goes both ways, depending upon the provider.  

Some ladies hold off on cumming themselves until late in the day to preserve energy and desire, if seeing her genuinely get off is important to you.

Some ladies will also be less clock-conscious with the last appointment of the day.

Some are night owls, and may not be at their peak first thing in the morning; others will have far more energy with the first few appointments.

Personally, I prefer to be first in the door, and most upscale ladies only see 2-3 gents a day (or less), so the above issues rarely apply.

Re-read your own example. Now, apply your own logic and what do you come up with?...

...While the other poster's advice was sound in that it really depends on the provider's circumstances, generally speaking most good service is given when a provider is rested and conversely most bad service is given when one is tired.  Obviously, there are exceptions.  Best advice is to look at the reviews, check her website, see when her hours of availability are.  Then make your decision off of all the info you've gleaned.