I try to plan a lesson that will take about 60 minutes. You can never time such a thing, each child works at their own pace. I have some students who are finished in 5 minutes and you look for ways for them to slow down and add more details, and other children take longer than 60 minutes and their work is so precise. These photos were of the last 2 girls that were in the class. It actually took them 1.5 hours to work on this. It shows. We had amazing results with what they painted. Take a look for yourself.