Our flight planning software for short stages (150 miles or less) seems to essentially aim for a derated climb to TOC = idle descent TOD plus a minimum 3-5 minute cruise to stage cool the engines (Not the Airbus, but the McBoeing with its BMW-Rolls Royce BR715s). Usually wind up with a longer cruise portion for longer flights, but not by much, maybe 8-10 minutes max. Typically below FL300, sometimes significantly so.