Final words
Business people have come to feel that they do
not have to respond to e‑mails quickly.  Each
day, they stop responding when they reach the
e‑mails that can be put into the “later” stack
because everyone has other pressing work to do.
They then allow the put-off e‑mails to age until
they reach the set point they and the corporate
culture have established: 24 hours, 72 hours, a
week, or even longer.
In other words, they respond when the e‑mail is
at a near-crisis stage.