It can be anything you want. Consider the location of the insert also.
Some tables have them centered. Mine is 1/3 from the front leaving a lot of
room in the back. The theory is that most things are small so you don't
want to have to be reaching in a lot. When you do have a large panel to
rout, you work from the other side and you have a much larger surface in
front of the bit. So far I agree with that theory.
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