Tempoh masa jawatan Khalifah tidak ditentukan dengan tempoh yang tetap. Selagi Khalifah mematuhi Shara', melaksanakan hukum-hukumnya dan mampu menunaikan tugas-tugas negara serta tanggungjawab Khilafah, beliau kekal dalam jawatan. Ini kerana nas-nas mengenai Bay'ah datang secara mutlak dan tidak dikhususkan kepada mana-mana tempoh masa tertentu. Anas bin Malik meriwayatkan bahawa Rasulullah ﷺ bersabda:

The time term of the Khaleefah in office is not determined by a fixed period. As long as the Khaleefah is abiding by the Shar’a, executing its laws and able to perform the duties of the state and the responsibilities of the Khilafah, He remains in office. This is because the texts concerning the Bay’ah came as indefinite (Mutlaq) and they are not restricted to any specific period of time. Anas ibn Malik reported that the Messenger of Allah (pbuh) said:

"Dengarlah dan taatlah, sekalipun kamu diperintah oleh seorang hamba Habsyi yang rambutnya seperti kismis." Dalam riwayat lain, Baginda ﷺ bersabda:

“Do hear and obey, even if you were ruled by an Abyssinian slave, whose hair is like the raisin.” In another narration He (pbuh) said: