Prophet advised imaams / aimma to not prolong prayers and give due consideration to the followers in various circumstances (old and disabled, working people, students…). A general advise is as follows. This is not binding on the imaams.
Fajra and Zuhr: Tiwaal e mufassal – from Surah Hujarat
Asr and Isha: Awsaat e mufassal – from Surah Burooj
Maghrib: Qisaar e mufassal – from Surah Bayyinah