To realize the value of one year
Ask a student who has failed a final exam. 

To realize the value of a month:
Ask a mother who has given birth to a premature baby.

To realize the value of one week:
Ask an editor of a weekly newspaper.

To realize the value of one hour: 
Ask the lovers who are waiting to meet.

To realize the value of one minute:
Ask a person who has missed the  train, bus or plane.

To realize the value of one second:
Ask a person who has survived an accident.

To realize the value of one millisecond:
Ask the person who has won a  silver medal in the Olympics.

Time waits for no one. Treasure every moment you have. You will treasure it even more  when you can share it with someone special.