I found lowering my coffee intake useful for my restfulness, but I didn't note any change in my neuropathy symptoms. I certainly am more introverted when less caffinated, which suits me okay in most situations.

How long until the onset?

As long as I make sure to hydrate properly after coffee I am okay. I lean on it for work on really bad sleep nights. Not like I used to, thankfully, though more than I would like. Maybe one day soon I will try to pare it down and test a "holiday".

I hope you didn't enjoy coffee too much in the past. It seems like it is a must avoid category.