The Away Routine starts after the last home member’s phone leaves home. The Home Routine starts when the first home member’s phone returns. This feature works best when everyone in the home shares their phone location. Otherwise, the Home & Away Routine might not start when someone who isn't sharing their phone location arrives or leaves. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.