The question of when to stop drinking coffee is a personal one and the answer depends on the individual's daily schedule. Some people may drink coffee first thing in the morning to wake up and be productive, while others may work hard all day and need a coffee break at the end of the day. For some people, 2pm can be a great time to have a coffee break. However, for others, this is too late and they should avoid caffeine for the rest of the day. While 2pm is a time that may work for some people, it is important to note that this is a personal decision.