that isn't the purpose of the ex 3 foxmouth if it is the start of the course.
It is for them to get acquainted with the sensation of flight and also the ground side of things.
If I was doing a zero to hero the ex 3 would take at least an hour if not an hour and half with 20-30mins airborne. Including 1 and 2
Pre flight pre brief would be the normal TF but also include exposure to techlog and paper work, airport rules and regs and ground emergencys. Flight wouldn't be to a area of there choice it would be to show them the training area and point out various land marks and of course have a bit of a laugh. De-brief on flight would be very brief mainly "did you enjoy that" then they would be sat down and the ground school and books sorted out. And have a question and answer session which the parent would sit in on if they were funding it. The student has to feel special, the parent has to trust you and there has to be a few ground rules to be set.
There is a knack of getting a full course out of a punter and unfortunately a hellva lot of instructors don't have a clue how its done,