Wednesday’s set points
nAs he reviews the other e‑mails from Monday and Tuesday, Derek decides that three of Monday’s messages must receive replies on Wednesday, giving them a set point of 48 hours.  Also, 15 of Tuesday’s messages must be replied to on Wednesday, giving them a set point of 24 hours.
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nHe deletes the six reminders e‑mails without response.  At the end of the day on Wednesday, he has 40 e‑mails from Monday, Tuesday, and Wednesday in his in-box.