It wouldn’t work for many reasons. If you wanted to phone somebody far away you would still have to work out which part of their wake/sleep cycle they will be in. Just because their clock says the same as yours doesn’t meant that they will be doing the same thing you are. You would still have to look up their location in a table to find out if it was a good time to call. There would be a bigger variation because without the hour slots, everybody’s circadian rhythm would tend to revert to local Sun time.
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