On Utub' you can have an idea clicking:
https://www.youtube.com/watch?v=HIWtTW7SCgI
Le tour du circuit de Charade en Formule Ford
Boxes are 6 meters by 4 meters you could have the key on the Thursday at 2 PM. You can leave the circuit on Monday but must empty the box on Sunday 7 PM the latest. Sorry if this breaks the forum rules.