Where is debounce interval located. I've read on line that it needs to be high for the limit switches to work. But I can't find it anywhere.

Config>General Config - upper right corner.

That's what I thought but I don't have that as an option I have config. and no general config under that. Any thoughts.

You must have a very old version of Mach3 or you are using Mach2. You will have two options under that menu if you are using one of them, the options are logic and state if I recall. Afraid I cant remember which it is in if in fact there was such an option.
Hood

I do have Mach 3 but I think it's 07 or 08 ya it's pretty old. Should get a new version. It does have state and logic. I'm not in front of my computer, but does that have the debounce option in there or is it called something else