We saw results right from day one. His language went from 0 to a 2 year old in the first year as well. We started with 35-40 a week. That is hard to say. Some states or school districts pay for it.
Some people use volunteers to keep costs down.
We used volunteers from our university at first. They provided 100 hours of free therapy in exchange for college credit. What they have found is that some children may have a problem with breaking down a protein found in wheat, barley, oats and rye, along a protein found in all dairy products. The protein in the grains I mentioned is called gluten. The protein in the dairy is called casein.