Not the parent commenter but it might take you a few days. I used to be a 2-3 cups/day drinker and I was fine without coffee (while on a vacation) until around

Not the parent commenter but it might take you a few days. I used to be a 2-3 cups/day drinker and I was fine without coffee (while on a vacation) until around the 3rd day when I started getting horrible headaches. I used that vacation + about another week to fully quit.