Bad to let Mac Book Air Fan run full speed all night?

I ran a full Diagnostic test overnight on the "Full Test" mode and little did I know the fan ran at max speed for 6 hours.  There were no problems detected but is this bad for the fan?  The computer was warm but I shut it off.
Thanks

I wouldn't worry too much about it. You will likely put your Air through a whole lot more many times over than a little six hour session with the fan going at high RPM.
The fans themselves have not had much of a history in many years, and that's probably very good. Not sure about the air, but many macbooks use Sunon MagLev (Magnetic Levitation stabilization) fans that really make the bearings last a long time, usually exceeding that of the rest of the machine. I know it's a Sunon fan, and has a similar part number as compared to others which are definitely MagLev.

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