If it helps, I found that making shorter animation timeline segments decreases the time it takes to load the Render environment. I'm not sure why but it does for me. You just have to be careful if you make a lot of camera moves, I still haven't figured that out completely.
There is a limit on the file size/time you can render an movie within Studio. It's been there from the onset of Studio. You choice would be to do a number of small AVI's and piece them together in a movie software such as Pinnacle or Premier.
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