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RAID10 vs RAID50 Rebuild Times

We are getting to ready to purchase a Dell EqualLogic PS6100 with 24 x 900GB drives (10K).  I am having a hard time deciding whether to set them up with RAID10 or RAID50, and it seems like everyone is divided on which is best.  For our applications, I believe either will provide adequate performance and disk space.  What concerns me is the longer rebuild times in a RAID50 array if one of the drives fails.  Does anyone know if there is a formula to calulating this (one that you don't have to be Albert Einstein to calculate)?  Is there really a significant difference in rebuild times for RAID10 vs RAID50?  Are we talking several days vs several hours?
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WalkerCountyTX
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WalkerCountyTX
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mastooCommented:
You might have seen this already but it gives a good explanation:

http://en.community.dell.com/dell-groups/dtcmedia/m/mediagallery/19861480/download.aspx 

The most interesting part to me was they no longer recommend Raid 50 for some configurations.  Related to your question, the time will vary based on your usage but notice that Raid 10 has little performance hit during the rebuild as opposed to the Raid 50.  I haven't talked to our dell guy but after reading this I'm considering moving ours from Raid 50 to Raid 6.
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