What is meant by "when you return"?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. It means: when you have returned to your cities. [Ibn ʿAbbās, al-Ḥasan, Abū al-ʿĀliyah, al-Shaʿbī, Qatādah]
2. It means: when you have returned from your Hajj. [ʿAṭāʾ, Saʿīd ibn Jubayr, Abū Ḥanīfah, Mālik]

Al-Athram relates: I asked Abū ʿAbdillah (meaning Aḥmad ibn Ḥanbal) about fasting the seven days upon returning—when should they be observed? While on the road, or when one reaches his family? He replied: "Both interpretations have been given by people." Abū ʿAbd Allāh (Aḥmad ibn Ḥanbal) was asked if they could be fasted separately (rather than consecutively), and he permitted that.