Digests are somewhat sporadic -- they're distributed whenever a certain amount
of traffic has accumulated or a certain time has elapsed since the previous
digest distribution. I don't recall the exact settings, but in the last few
months a zoomer-list digest has been distributed every one to four days and
they tend to be 5KB to 25KB in size. They're organized chronologically, not by
thread.
-- -Brian Smithson brian@grot.starconn.com