Fio:
It took me a couple of months but I worked in spurts (carpe maņana) . No idea how many actual hours I put in but it was a lot of work, mainly to get it to look attractive. I'm sure if I ever had to do it again, it would take a fraction of the time since I had no idea what I was doing.
Please describe the oven you are building (size, materials, shape, etc.) Thanks.
Bill/SFNM