I'm trying to stop drinking coffee. How long will it take to be "off" of coffee, and free of caffeine withdrawal symptoms?

Depends. It depends how long you have been a coffee drinker.
Couple weeks. The worst of caffeine withdrawal is usually over in 3-5 days (severe headache, irritability, lethargy, low energy), but can last a few weeks in some people, but generally gets better day by day.