Why are some people punctual while others struggle to be on time? According to authors Grace Pacie and David Robson, who study the psychology of being late, punctuality is actually a personality trait and all people fall into one of two categories: timekeepers or time benders.

Obviously, timekeepers are very aware of the clock. Time benders, on the other hand, don’t like routine but tend to perform well when faced with time constraints.A 2016 study by Washington University found that time benders actually experience time differently depending on the situation. When given engrossing tasks, some were able to estimate the time, while others became so deeply concentrated they lost track of the time.

Learn more by following Grace Pacie on Twitter, Facebook, and Instagram. Check out more about author David Robson on Twitter and Amazon.