Have the oddest SLA requirement I've ever been asked to have a look at,
hope you can help.

Basically have a set of data of closed records for 2005.

My manager wants to show of the closed records how many days were 90%
of them completed?

She is looking at this as a 'best case' scenario, so therefore in
simplistic terms this means:

If there were 50 records closed, look at 90% of these records (in
shortest amount of days order) and give the highest number once at 90%.

e.g. (with a small dataset). There are 50 records. The largest number
of the dataset once sorted is 20 (at the 45th record).

Hope this makes sense, any questions please let me know.

Thanks, Al (mralmackay)