“Time blindness describes difficulty sensing how much time has passed and estimating how much time is necessary to complete a task, according to the Attention Deficit Disorder Association (ADDA).
It is not an intentional disregard for time or a sign of disrespect. Time blindness is not a sign of laziness, self-centeredness, or lack of motivation. Often, people who experience this phenomenon want to complete tasks and arrive at appointments on time.
Scientists are still learning about how time perception works, but a popular theory is scalar expectancy theory (SET). In SET, time perception works through an “internal clock” in the brain through which a person’s pulse rate measures time. The brain combines this information from the pule with other sensory inputs, such as temperature and brightness levels, to calculate where someone is in time and how fast they are moving through it.”
https://www.medicalnewstoday.com/articles/adhd-time-blindness#the-link