Is there a "standard formula" for measuring for shock length.

The two mounting points are 14 1/2" apart. I know the shock has to be able to extend/compress so basically my question is "how much". I don't think there will be a problem with extending, but more of how much the shock should be "out" for compression.
Hope you understand the question....I know many of you have probably been through this exercise.

I'm listening, so educate me!.


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