Reasons for being delayed:

There can be several reasons for being delayed, but one major reason is not realizing that time passes quickly. Let's explore this in more detail:

Absence of clock, phone or computer:
- Having access to a clock, phone, or computer can definitely help in keeping track of time and avoiding delays.
- However, this is not the major reason for being delayed, as there are other ways to estimate time, such as looking at the position of the sun or using a timer.

Being overindulged in work:
- Being too engrossed in work can lead to delays, as one may lose track of time or underestimate the time required to complete a task.
- While this can be a contributing factor, it is not the main reason for being delayed.

Not keeping a margin in the expected time of work:
- Failing to allocate extra time for unexpected delays or contingencies can lead to delays in completing tasks.
- This is an important factor to consider, as unforeseen circumstances can arise and disrupt the planned schedule.
- However, this is not the major reason for being delayed either.

Not realizing that time passes quickly:
- This is the correct answer, as many people tend to underestimate the passage of time when they are engrossed in an activity or task.
- When individuals are fully focused on a task, they may not notice how quickly time is passing, leading to delays in completing other tasks or appointments.
- This can happen due to the phenomenon of "time distortion," where our perception of time is altered when we are engaged in an enjoyable or absorbing activity.
- For example, someone may start watching a movie and lose track of time, resulting in being late for a meeting or appointment.

Conclusion:
The major reason for being delayed is often not realizing that time passes quickly. It is important to be mindful of the passage of time and allocate sufficient time for tasks to avoid delays. Using clocks, phones, or computers, being mindful of workloads, and keeping a margin in the expected time are also helpful, but they are not the main reason for delays.