Travel mode

Dhuhr, ‘Aṣr and ‘Ishā’ become two rak‘ahs. Ḥanafī: a journey of about 48 miles / 78 km; the others: roughly two marḥalah, about 80 km. Ḥanafī: shortening is required; the others: it is a concession.

Dhuhr with ‘Aṣr, Maghrib with ‘Ishā’, permitted in travel, illness, or hardship by the Shāfi‘ī, Mālikī and Ḥanbalī schools. The Ḥanafī school permits it only at ‘Arafah and Muzdalifah.

Drop the regular Sunnah rak‘ahs of Dhuhr, Maghrib and ‘Ishā’; keep the two of Fajr and the Witr.

Pray it as soon as you remember — “there is no expiation for it but that.” Make them up in order where you can, alongside the current prayers.