Panda recovery timeframe question
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Site was hit by Panda Aug. 22nd. Lost 90% of Google traffic. I know

We think we found a reason and made few changes to landing pages structure. Updated sitemaps submitted. When can we expect effect (if any) - few days or after next Panda data refresh? Thank you!P.S. What is also interesting, similar traffic loss from Bing/Yahoo happened at exactly the same date. Does that mean Bing is "stealing" search results from Google when can't provide their own relevant results?

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panda was not last week...
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Ah, thank you. Of course. Corrected: happened Aug. 22nd.
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There was a Panda update on Aug 20, so you definitely could have been affected around that time. Generally, there are Panda updates about once a month (usually every 4-6 weeks). If you've cleaned up well, then when there is another update (perhaps end of September) you should recover.
Be sure to have a good look for duplicate content issues and any pages with duplicate content on it as well.
It's a little bit strange that Bing and Yahoo dropped as well....makes me wonder if there was something other than Panda going on. Check out this article for other reasons for your traffic to drop.
Good luck!
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P.S. What is also interesting, similar traffic loss from Bing/Yahoo happened at exactly the same date. Does that mean Bing is "stealing" search results from Google when can't provide their own relevant results?

This is highly unlikely. We were hit with Panda, but our Yahoo/Bing positions were relatively unchanged. Most likely a coincidence.
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Out of total 365 days in a year both things happened at exactly Aug. 22nd. Hardly a coincidence.
Knowing that Bing/Yahoo indexed 100 times less of our pages than Google did it is naturally normal to assume that the reason may be in some out-of-website factors?