Who gets to waster your time?
There's only one right answer to that: you do. Anyone else wasting your time is truly a waste a time. We can waste our own time in rejuvenation, in recreation, in contemplation. Then it isn't really a waste at all. But, if someone else is distracting you, annoying you, and just wasting your time, why on earth should you ever tolerate that?
When someone is wasting your time, excuse yourself to work on a goal.
It's better than an excuse: it's a positive (and necessary) reason.
Goals must come before wasted time. Or it all becomes wasted time.
-- Doug Smith