If you have an external transmission fluid filter, you can change the fluid in 10-15 minutes without all the hassle of dropping the pan. Even if you have to drop the pan to change the filter, this method will change more of the fluid than just what is in the pan, so is a good idea anyway.
If you have an additional trans cooler or external filter it will be real easy, if you don't it may be a good time to add an additional trans cooler
All you need is a bucket, graduated in quarts, and some hose. I like to use a section of clear hose so I can see the color of the fluid coming out. You will need to divert the fluid flow as it goes to the cooler to your bucket, I do it between my additional cooler and filter as it is the easiest place for me to get at.
If you have two people you can try pouring in the fluid at the same time it comes out, but the odds are you won't keep up with it. I run the engine until 2 quarts have come out, stop, add two quarts, run the engine again, etc, etc.
By about the 8th or 9th quart the fluid is looking pretty good. Once it looks good I just run another couple of quarts through for good measure. Then reconnect everything, check the fluid level, and call it a day.