Time

What is time?  How do we define something so broad?  Is it a second, minute, hour, day, week, month, or year.  Time is past, present, and future.  We have in our possession the ability to define or broad time.  So, why do we limit ourselves to thinking in such short increments of time?

I feel it is because we can'[t think of time as more then the amount of time we have experienced at that moment.  The thing is time has always been and will continue...