So I have made my explode that way I like it but I would like to make the default explode animation longer so it runs slower. How can I do this without creating an new motion study from scratch?
I don't think you can control the explode/collapse animation (in the configuration tab) beyond what you get on the tool bar 1/2x and 2x. You'll have to create an animation. Just use the wizard and you can have an explode and collapse with your timing in a few minutes. It's not hard at all.
Here is the correct answer to your question:
Go to the motion study tab as if you were going to animate motion. Select the Animation Wizard button (looks like a movie camera) and select explode in the settings. You can then set the time to whatever you want.
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