Every provider knows her own limits.  Some will only see 2 or 3 clients in a week, and others will see multiple clients in a day.  The only responsibility you have is to read her ad and website carefully and know what her hours are (you don't want to be calling a daytime provider at 3 AM).  Make your dates during times that work for both you and the lady you are interested in seeing, and everything will go fine.

Depends...

It all depends on the provider and her hours. For me I start early in the morning until mid afternoon so I am at my best. After resting for some part of the day I will take appointments only one or two at night so I am still not over worked. But that's just me... I know some women may not even start their shift until night time and I assume they have rested during the day...

Are all the ladies you know in your private civilian life at their best at the same time of the day? Of course not. Some ladies are morning people, some ladies function best in the late afternoon and others are night owls. Every lady is different.

Well, providers are no different. Some ladies are morning people and may be at their peak at 7AM. Other ladies may not go to bed until 7AM and thus you'll need to see them during the evening hours. Again, no rules. You should first determine when you function best and see if a lady can accommodate your preference.

A good provider will be fresh and ready to play at the time of your appointment. If you booked the last hour of the night, and she accepted your time, then she should NOT be tired and dragging. If she is, you're getting cheated and she shouldn't have made the appointment in the first place. Conversely, if you made a 7AM appointment and you show up and she is completely unkempt and is obvious she rolled out of bed 5 minutes ago, again, her fault.

Just use some common sense in the hobby (equate it to your private life) and most times you will figure it out

dance card was that day and a day or two previous.

There is no rule of thumb for this. As others have said--don't overthink this part of the game.

For me, I'm at my best when I can get away to play.

i love morning woodsap..

If she is a good provider, she'll bring her A game to you no matter what the clock says.

Is she isn't, then it really doesn't matter

...are willing to accommodate me.  Recently, I saw someone at 10:00 pm.  When I left, I had to turn off the lights and let myself out.  By the time I shut the front door, she was sound asleep.  She was obviously a morning person - lesson learned.

You all made very good valid points....so good that I'm not going to dwell on it at all. I do tend to overthink things, sometimes more, sometimes less. It's an occupational hazard that sometimes has gotten me in trouble, and sometimes has been a good thing lol.  
My only hope now is that some others may learn something from your expertise. Thank you all!!!