Imagine, if every morning you get a message from your Bank branch that you are being credited 86400/- rupees and those will expire on that very day in midnight. This happens every day, what will you do? Spend every bit of it before it's gone and not let any of it getting wasted, right?

Similarly God has given humans 86400 seconds for a day, every second is precious similar to the money but gets wasted sometimes consciously and sometimes unconsciously. It is us who decides how to use that time efficiently and bring our perfect time.
Thank you