Does anyone know the update frequencies for the various shopping search engines?

I am particularly interested in Froogle and BizRates time to update. Example: I send a feed at 8am (est) when does Froogle display the revised feed? etc.

Thanks.

Froogle allows daily, weekly or monthly uploads of data feeds, so I'm assuming that the results are updated whenever the feed is updated... Is there lag time? Maybe... But they'd need to have the updated feed reflected right away in order for their results to be relevant to the user.

Usually, Froogle takes a couple of days or so after the feed is received. It's been acting a bit flaking, though, lately.

If you have sites that run this frequently, I would be very interested in learning the averages of each shopping search engine.