Which activities make you lose track of time?

I am obsessed with time, but
Time is not always as kind to
Me. Nor as thoughtful. It just
Passes me by, willy-nilly and
Careless as you please. Time.
Where does the time go? Why
Should its passing mean so
Much to me when it cares so
Little? I'm obsessed with time
But it doesn't give a fig for me