Metro ground schools range from one day to seven days.
The one I did lasted seven days, and I found one needed to do plenty of study after hours to keep on the ball.
The electrical system was no drama, if you were taken through the system thoroughly and explained the basics and draw the diagram each time.
Dunno how the ground school could be compressed into a day and still be CASA approved!!
For a lot of people the Metro was their first turbine aircraft, first pressurised aircraft, first multi-crew aircraft, first aircraft above 5700kgs, probably first time they had flown above 10,000', first time they had seen a weather radar, first airline job and fisrt gig flying from the Right hand seat.
Lots to learn in the ground school.