Some families start school in the morning and some in the afternoon. A few even prefer evening hours. Some families split up the day with morning class, household chores, community service, etc., then more class in the afternoon. The school calendar is also personal choice. It is required by Idaho law to have a total of 180 days of school a year, but these may be any 180 days.
Some families prefer to follow the public school calendar.
Some families choose to hold school year round. Some have three weeks of school followed by one week off all year round. Some families teach all summer and take winter vacations. There are many choices. Only you know yourself and your children best.