Mac mini  and macbook air startup takes hours

When I restart my mac mini, it takes approximately 16-18 HOURS to boot. During this time the grey screen is displayed with the Apple logo, and the turning wheel is turning and turning but nothing happens.
I updated the mac mini to Mountain Lion.
What is funny, my macbook air has exactly the same problem. So I dont think that this is a hardware related problem. My macbook air takes about 8-10 hours to restart.
Anybody has the same experience or has a solution?
Again, both my mac mini and macbook air have this problem.
Thanks!!

Whew, this is incredible!?
See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free Disk space do you have also, click on the Memory & Disk Usage Tabs.
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
In the Memory tab of Activity Monitor, are there a lot of Pageouts?
Open console in Applications>Utilities, check the system log for the date/time of the last  Startup for clues.

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