Just to confirm with some examples of checkride length...

Most of the Instructors I know, myself included, had intial CFI practical tests lasting anywhere from 6 to 10 hours, including the flight.

Mine in particular, was about 7 hours ground and about 1.7 hour flight time.

Of course, I failed mine halfway through when I became arrogant, and thought I could whip up a lesson plan without once referencing the PTS. Big mistake and one I frequently tell students as a lesson in arrogance.