How long does it take for a teacher to prepare to teach this curriculum?

This will vary depending on your style and familiarity with the style of the curriculum lessons. In general, however, the time may range from one and a half to two hours per lesson.

One teacher outlined her lesson preparation in this way:

About one or two weeks before the lesson, I read through the entire lesson so that I get the big picture of what is going on in the lesson. (15 minutes)

After reading through the lesson, I spend some time looking up the Scripture texts. I meditate on what this lesson is saying about God and what it means for me personally. Throughout my week, I think about the lesson and the texts and try to internalize how it applies to my life at this time. Sometimes I think of a related book or sermon that I've read and then go back and re-read it. In order to be authentic in my teaching I want to be spiritually prepared by really understanding and loving the truth that is presented. (30-45 minutes looking up texts, etc.)

Several days before the lesson I get all the visuals together and plan how I am going to incorporate the visuals in the teaching. I sometimes teach the lesson quickly to my spouse, using the visuals as I would in teaching the children. (30-45 minutes)

To simply read and understand the lesson and get visuals together, you could probably prepare in 30 minutes to an hour, but if you want to teach from an overflowing heart, spending time throughout the week is really beneficial.