While the Institute is away at a corporate retreat, far, mostly, from the interwebz, I've arranged for some dips into the archives.
Every profession measures time differently. Doctors and lawyers measure time in hours or vague lumps. Teachers measure time in minutes, even seconds.
If a doctor (or his office) tell you that something is going to happen "at nine o'clock," that means sometime between 9:30 and Noon. Lawyers, at least in my neck of the woods, can rarely be nailed down to an actual time. Anything that's not a scheduled appointment is "sometime this afternoon." Even a summons to jury duty will list a particular time which just represents the approximate time at which things will start to prepare to begin happening. Further up the Relaxed Time Scale, we find the delivery and installation guys for whom "Between 8 AM and 3 PM Tuesday," means "Not at all on Tuesday."