I was a piano student as a kid, and I figure I've spent several years in aggregate locked in combat with that ticking monster. As a result, my internal clock is about even with the Naval Observatory. It bothers me, as I hear time slipping or speeding up the way folks with perfect pitch are driven crazy by how out of tune most of the world is.
The short test: Get a clock on the wall, your watch, anything with a second hand. Watch the second hand, and count along, 'one, two, three . . . ', the first twenty or thirty seconds. Then turn your eyes away and keep counting. When you get to '56, 57, 58 . . . . ' look back and see if you're still in sync. This can make some folks crazy, so consider yourself warned !