AmblesideOnline uses Signs and Seasons in Years 7-9. The official schedules for those years include broad ranges of the book for each term. It's up to each family to decide how to spread that work across the term. Here's one way of doing that. There's no magic to this, so consider this just an example. You could divide up the work vastly differently and have it still be as good or better as this arrangement.
Each column in the table is one week. In each week, you'll have one passage to read (except where that week has dashes) and two field activities. Generally, you want to keep a record of the field activities in your field notebook or journal.
