Thoughts on when to whistle

[Clark Kent]

OM 2.2A8 says "The administering official shall sound the whistle to indicate play is about to begin only following a charged time-out, an intermission or an unusual delay"

What do we deem an "unusual delay"?

I agree with those above and will most likely continue to blow before I inbound the ball (especially in the front court) on every inbounds unless told contrary by a supervisor/assignor.