This report is also narrated from him in al-Mu'jam al-Kabir. He narrates that the Prophet (peace and blessings be upon him) said: "At the time of Maghrib, give (the adhan) promptly, when the sun has set."
Its chain is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 1736