You never can tell, really. I've been early in the morning, which was very good...later in the evening..usually good, but can seem rushed closer to quitting time.
I'd have to say that a better time could be had in an early afternoon time frame...1 to 4 PM. The "Lunch Time Crowd" is gone, but the "Rush Hour Crowd" is still at work. I have had the experience, twice, of getting a new provider to work on me, which is always interesting.
Advantages of being there early in the morning...You might be the AMPs first customer, or that providers' first customer (therefore they are more "fresh" for you).
Disadvantages of an early morning visits...You might be there before they are completely ready and have to wait for everything to be set up...or for all of the providers to be there, and ready.
Advantage of being there later in the evening...You might be near quitting time and they figure that you are going to be the last, so they might be more outgoing with you.
Disadvantages of later in the evening...You are there near quitting time, and they just want to get you out so they can go home and unwind....You are there last...but how many were with the provider before you...two, three, five, ten? These women work very hard and could be very tired (or sore) at the end of their day. Some of the providers are there all day...could be a ten, or twelve, hour work day.
Basically, you usually get a good session, but like any worker on any job, there are days (or hours) where they are just not as into the job as the customer would like them to be.
If you feel like your provider wasn't quite up-to-snuff, if you say something to her, or the mamasan, they might give you a card with a 10 or twenty dollar discount on a future session.
Just don't go all cheapskate on them and really short change them on their tip. You'll see where some might only leave a smaller tip, even when they got near maximum service...you could tip a little less, but don't cut it 50%.

Relaxn,
I think you covered it all..especially good point about the tip at the end of your comment.
Personally I like the early afternoon after lunch time first and then the first thing in the morning when I can get there. It's nice to spend time talking with the girls while they're getting ready in the morning. One had me follow her around as she did the usual things around the shop and then on into the bathroom where she just continued talking as she peed, put on a little makeup, and away we went. I seriously thought about dropping my pants while she was sitting there on the toilet but didn't. Next time it will be a'you showed me yours, I'll show you mine' and see what happens...

Cracks me up how asians frequently are not shy about peeing around guys. I have had asian girls I dated who would pee in my bathroom with the door open before even allowing me to go all the way with them.

Any time is a good time for an Asian he.

Stroker, do you mean happy ending or ladyman?

He-bitch ...man whores...twatcicles...oh my!

Happy ending is the typical translation on this board for he.

Happy ending is the typical translation on this board for he.

You need to send me a PM, OTB, and tell me where that was! :-)

Classyexec