QUOTE(Moshi @ Jan 6 2007, 07:35 PM) [snapback]757538[/snapback]
I think people retain a bit more than 1% after proper lectures/shiurim, and after the rabbi's shabbos speech (if it's a good rabbi). But the 3-minute dvar torahs at various kiddushes etc. are not retained at all. They are useful only insofar as the preparation of the dvar torah-giver. I think they're pretty much a glorified "thanks for coming" announcement.
True, some divrei torah are for the benefit of the deliverer - so demonstrate his eruditions to the crowd, as a vehicle to learn by preparing, or whatever. But a killer 3-minute dvar torah can be retained. In fact, I would argue a killer 3-minute dvar torah can be better than a one hour dvar torah.
QUOTE(Moshi @ Jan 6 2007, 07:39 PM) [snapback]757541[/snapback]
ETA: It's interesting that Rashi says that. Because there's also an opinion that just showing up to a shiur is talmud torah, there's some story like that about some old unlearned man who wanted to come to all these shiurim, and his wife complained to the rabbi that what's the point of him coming and i miss him at home, and the rabbi said something about the fact that he still gets something out of it, just by observing etc. (IIRC)
And in olam ha-ba you will remember and understand all the divrei torah through which you sat dumbfounded. So they say in the name of the Zohar, although personally I think that's an interpretation of the Zohar rather than a quote of the Zohar.