Depends on the definition of "normally".
For instance, Scott Rao, in his book "The Coffee Roaster's Companion" on page 40 says:
Classic drum roasters: 10 to 16 minutes
Indirectly heated drum roasters and roasters with perforated drums: 9 to 15 minutes
Fluid-bed roasters: 7 to 11 minutes
Klaus Fricke in his book Kaffeerösten zu Hause, page 87, compares slow roasters (12-20 minutes up to 30 minutes) to fast roaster methods (3 to 15 minutes).
Kenneth Davids, in his "Home Coffee Roasting" book:
"Don't be fooled by the illusion that there is some absolute 'right' time for a good roast. Some small fluid-bed machines do a splendid roast in three or four minutes."
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