So how long does this take? (put in place an intensive maintenance ash damage inspection before and after each flight)
Paraphrasing from a knowledgeable fella on another board
Assuming engine has cooled down a bit and there are no hiccups in doing the job
5 minutes to get the cowls opened,
3 minutes to get the boroscope plugs out,
5 minutes to get access to turn the N2 rotor through the gearbox,
10 to 30 minutes for inspection
X mins to send pics for analysis if there's an obvious issue/concern
30 -60 minutes to get the plugs back in and locked,
5 or ten to get the N2 drive pad access cover back on
Y minutes for a leak check (possible engine run rqd)
5 minutes to close the the cowls
Total time required = 63 + X + Y minutes
(varies per engine type)
Summary - you could expect an average of somewhere between 75 - 90 minutes