The author recommends the lessons be woven into your days, e.g. the poetry informal lesson
could be done during tea time, the challenge (replacing an English sentence with Spanish) when they wake up and so on.
For the early years, two lessons of five minutes a week where the child learns a very short song for a month through play and exploration is suggested.
For the formal lessons for Year 1, two lessons of ten minutes each week are recommended and one ten minute lesson a week for the poetry recital. In addition, a lesson of fifteen minutes a week for song study is suggested.
Audio links to Spanish music, stories, songs, and pronunciation are given via QR codes which are very easy to link to with a mobile phone. Nature walks, poetry and Bible verses are included in each unit.
As you can see, this is a very immersive and gentle method of learning a foreign language which is very consistent with a Charlotte Mason approach.
The home page of the Charlotte Mason Simple Spanish website has a link, Expectations by Age, which has ideas on how to use the curriculum with different ages.
Charlotte Mason Simple Spanish is an economical and attractive curriculum. There are some free resources to download and if you subscribe to the website you get 15% off your order.