To make your first piece you will need about 20 to 25 hours.
Workshops are usually 3 days long, and involve the making of a bedside table, with pigeon holes, drawers, sharp and round lines, allowing us to go over all the basic aspects of cardboard furniture making.
The number of students being limited, you will be able to ask specific questions and get personal attention.
At the end of the 3 days you will take your creation home, along with all the knowledge needed to get started on your own projects.

Photos: Cardboard Furniture Making Workshop in the NGV artist studios as part of the Vienna: Art & Design exhibition - August 2011.

Update: Currently opening up a café in Paris 10th, I do not hold any more workshops at the moment.