Two years ago I quit drinking caffeine for 2 or 3 months. At first I was tiered more often, but after a while (maybe 2 weeks? Can't remember exactly) that went away. After that I felt pretty much the same as with caffeine, not noticeably better or worse. Since I didn't feel better and I like coffee, I started drinking that again.
For example I like beer and wine a lot but I can go many weeks without drinking them. Coffee I drink everyday, because I want to of course