I don't think there is a hard rule around half life times, individuals metabolise it differently. Its also not just about the caffeine leaving your system, but

I don't think there is a hard rule around half life times, individuals metabolise it differently. Its also not just about the caffeine leaving your system, but the impact of cortisol being increased along with any other stresses you might have on any given day. I honestly prefer not drinking it all now. I operate better, feel more relaxed and its nice not having an addictive dependence to plan around (although its a less problematic one as coffee addiction is well catered towards). It's one of the best things I have ever done to improve my life, why would I want to try and sneak a bit back in.