Had a lady over for a 1hr session. Got to chatting, have a few drinks and before you know it she's already been there for 2hrs already. Had a great 1hr of fun still. Total of 3hrs. Mind you we've seen each other before, we vibe well, always chat a bit. She didn't seem to care other than that it was super late. I felt bad so paid for another hour, especially since she's super hot and fun  

In this case obviously she didn't care because she likes my company and she's a chatterbug. But who's ultimately responsible for watching the time. It's one thing if I'm trying to purposely extend. And I'm definitely not looking for long talks but if a lady wants to unwind and chat a bit (assuming I like her personality) I'm not opposed to it. If it builds a bit of chemistry I'm all for it. However, what if she'd said (which this girl would never do) "hey I have been here for 3hrs hours, pay me more"? Would I be on the hook for that? Or worse, what if she had said "I've been here 2hrs already, peace out"? I'd basically have paid $600 to chat.

My opinion is that the lady is the one to guide the session for it to end within alloted time.  

She's the only one who knows when her next appointment is, after all. But I always took it on myself to monitor the time so I didn't get an unwelcome surprise.

I would agree it is up to the lady. I do get chatty as well with clients I like, so if we go over 15 or 20 minutes I think that is on me. If I am going to you and you booked an hour and I politely let you know I have to get going and you ask me to stay longer I would ask for my additional rate. I don't think you did anything wrong in the situation.

It's on her. I did a rare outcall for a one hour appointment. The young lady stayed 8 hours. Like in your case, she loved to chat and we had great chemistry. She was very low volume.  

I booked her again a few months later for an outcall and the same thing happened. Nothing was said about the over stay or the time.

You agreed on an amount, paid her, and that's all you owe her. End of story. And if it ends before I nut, that's on me, so I set my watch at the beginning. (Of course, I know it isn't the 'end of story,' there's always somebody with another view. But I ain't giving her a dime more.)

a provider say, “You’re paying for my time”?  I see that a lot in ads and web sites.  

 
So to be clear that I’m making every effort to stick to my agreed time, I do keep track, and when it’s getting close to “time’s up”, I use words and actions to let her know that I know.  And often she’ll say something like, “That’s ok, no rush”, so I’ll hang around if I can. Or she’ll make it clear that it’s time for me to go.

 
I also don’t let a provider use up a lot of time talking, unless it’s a long session and it’s someone I enjoy talking with, such as my ATF. I take the initiative to move things along.

I see your point. And usually after 10 minutes or 1 drink I'll usher it along as well. In this case it was literally one of those look up at the clock "oh damn we've talked 2hrs" type of moments.  

Just got me wondering who is actually responsible to tracking time. My opinion is still that since it's her time it's her responsibility to move things along.

When I go to her, incall... I monitor the time. When to start and when for me to leave. I never overstay my allotted time.
But when I have them come to me, outcall...it's on her when she wants to leave. I won't spend alot of time with the chit chat I normally get going kinda soon. So if all is going well then I ain't throw her out. It's all on her,after all mi case, es su casa.

specific amount of time.  It up to you to keep track of the time.  If you chronically overstay, you will eventually not be able to get any more appointments with her.  The gray area is if you are a generous tipper.  If you're a regular and she KNOWS you are going to tip her well, she will often extend the time without charging for it, instead depending on YOU to show your appreciation for the extra time she gave you on spec.  However, even in this case, when your time is up, you should remind her that your time is about up.  If she wants you to stay, she will invite you.  If she says she will see you next time, then leave.  If she has no other customers booked after you, she may invite you to stay for an extended social period just to have someone to talk to or a cup of coffee to share with you.  Follow her lead.  

This makes sense actually and I guess subconsciously I do the same.

I typically tip 20%, in this case because it was so extreme I tipped 100% (although technically I still only paid for 2 put 3 hrs). I definitely don't chronically over stay which is why I was shocked and thought of the question. I've got plenty of regulars who will extend social time afterwards and come for dinner or something otc. But in this case I was curious because essentially the extra time was up front so I guess she could've been justified in saying my time is up.