I was at camp and getting ready to lead a workshop teaching cooking on a campfire. Luckily it had not rained for a few days so all the wood in the area was dry. I had some large logs that were sitting by the fire ring so I went searching for some smaller sticks and kindling. I built a log cabin structure out of the larger logs. Inside the log cabin structure I put some very small tinder as well as some balled up pieces of newspaper. I lit the newspaper and continued adding very small pieces of wood to it. When the small pieces started catching I started adding larger twigs. As smaller pieces started catching on fire I kept added larger and larger twigs and sticks until the big logs started burning. I continued to add sticks so I could get a nice sized fire burning that would create lots of hot coals so we could cook on them. 
Question: How long did it take to build the fire?
less than an hour