The 'Drift down'aspect applies with Terrain concerns.
In the 320,one can lose the engine,apply MCT,slow to best L/D speed,AND TAKE AN HOUR to drift down to the engine-out alt.
Over the prairies one can descend IMMEDIATELY to the egine out alt at a higher speed..
The driftdown rate is in the 2/300' feet per minute range-lots of time to decide where to go,and how fast
cheers
