Hot topic here in Utah at the moment... one of our state legislators sponsored a bill to ban all non-compete agreements. Angry business owners seem to have melted his phone.
As stated, internet advice is what worth what you paid for it.
If both my brain cells are still functioning, what they taught us in MBA school several decades ago was that for regular employees, the rule of thumb was that you could enforce a non-compete on a regular employee (not someone with access to stuff like corporate financial info) for about a year. As Matt said, it's based on "reasonableness" and that varies from time to time and place to place.
If it were me, I wouldn't worry about it. Yes, sometimes those clauses get enforced, but it isn't common outside executive positions. Sometimes during a corporate restructuring, executives being sent packing get a severance package, and non-compete is one of the terms of the package. That's very enforceable.
