Hazrat Malik says that I asked Hazrat Jabir bin Zaid: I stay in Kaskar for one or two years and become like the residents there, so how many rak'ahs should I pray? He replied: Pray two rak'ahs.

Hazrat Abu Wa'il says that I performed two rak'ahs with Hazrat Masruq in succession for two years, then I asked him, "O Abu Aisha (may Allah be pleased with her)! What motivated you to do this?" He replied, "The desire to act upon the Sunnah."

It is narrated similarly through another chain of transmission.

Ibrahim says that I stayed with Hazrat Alqamah in Khwarazm for two years; he used to offer two rak'ahs.

Hazrat Muhammad bin Abdur Rahman bin Thawban narrates that the Messenger of Allah (peace and blessings be upon him) stayed in Tabuk for twenty nights, and he used to offer two rak'ahs of the traveler's prayer.

Hazrat Aamir narrates that Hazrat Alqamah stayed in Marw for two years for jihad and used to shorten the prayers there.

Hazrat Ibn Abbas (may Allah be pleased with them both) narrates that the Noble Prophet (peace and blessings be upon him) stayed and prayed for seventeen days and he used to shorten the prayer. Hazrat Ibn Abbas (may Allah be pleased with them both) says that whoever stays and prays for seventeen days should shorten the prayer, and whoever intends to stays longer and prays than that should offer the full prayer.

8430 - Ibn Abbas said: Whoever stays seventeen (days) shortens the prayer, and whoever stays more than that completes (the prayer).