The suggestion is to keep crunching and send more. Don't worry about it too much. Units can usually take 1-7 days to be validated. If three units have not returned correctly, it will even send out #4 with a due date of 1 day, for fast results.

The unit from March 6 should be validated any time. I assume that your workunit was a valid result and did not have a computation error.

I recently closed off new work, sent everything in, turned off the computers, and was recently out of town for 10 days. When I came back, I noticed that workunits were validating nearly every day. It also took a few days to reach a steady state of points after I returned, due to the delays.

I have a much higher number waiting validation from 3rd March than any other day, the work unit deadline is tomorrow after that they get resent and as the other post has said credit will quickly follow. If you go to results status then click on work unit name for one of your pendings you can see your claimed credit and what is happening to the other 2 with the same work unit, the deadline date (usually a week I think) shows so you can see when it will be reissued if required.