Wow. That's one heck of a sentence with no punctuation. I can read it at least three different ways, but I'm pretty sure you're having a serious transmission problem. First of all, you have caused more damage and expense by trying to make it keep going. When the slippage starts, it could be as simple as low fluid level due to a leak. Fixing that leak is usually relatively inexpensive if done right away. The problem could also be due to worn clutch plates, especially at the mileage you listed. If that's the case, a rebuild will take care of that, but it will be a lot more expensive. Clutch plates and seals will be needed. By forcing it go a little further, you will have seriously overheated the clutch packs and all the other internal parts. Now bearings, thrust washers, and any warped parts will have to be replaced.
You apparently don't know much about working with mechanics. They know exactly what they're talking about, ... You don't. There is no way they can know the extent of the damage without taking it apart to perform a diagnosis. If you're "jumping from place to place", there is no way you can possibly expect to get good results. Every mechanic has to start over from square one to try to figure out what is going on. That's like going from one doctor to another without giving any of them the chance to do any tests to figure out what's wrong. Stick with one shop and let them see the problem through.
There are indeed times when a transmission could hold out well over a month or many miles if you baby it but there's no way to know for sure. I certainly wouldn't drive it any further than I'm willing to walk back home. Even then, you're just delaying the inevitable. The damage has been done and it's just a matter of time before the transmission fails completely.
Wednesday, December 12th, 2012 AT 10:31 AM