It is prescribed to make up the regular Sunnah prayers if they are missed because of an excuse which led to one missing them at the proper time, such as sleeping, forgetting or being too busy to do them. So, if you are unable to offer the regular Sunnah prayers before and after Dhuhr at the proper time, it is prescribed for you to offer them after `Asr.

It is not prescribed to offer voluntary prayers after praying the two Sunnah Rak`ahs of Fajr and before Iqamah was called for the obligatory prayer.

Scholars differed with regard to making up Duha prayer. Some of them view that it should be made up, and this is the correct view according to the Shafi`is and some of the Hanbalis. Others view that it should not be made up.

If you miss `Isha’ and arrive when the Imam is praying Tarawih, it is better for you to join him with the intention of praying `Isha’. If you miss part of the Tarawih prayer, do not make up that part after Witr. Rather, if you wish to make up for what you missed, wait until the Imam finishes praying Witr, and do not conclude your prayer with him. Instead, stand up and pray an additional Rak`ah, then offer the prayers you missed, and then conclude with Witr.

There is no specific number of Rak`ahs for Tarawih prayer, such that it is not allowed to do more or less than that. Whoever prays Tarawih with 30 Rak`ahs, or more or less than that, there is no blame on him, and he is not innovating by doing that.

The regular sunnah prayers that are offered before an obligatory prayer must be done after the time for the obligatory prayer begins.

It is prescribed for a menstruating woman to offer the supplication of Istikharah without praying (Salah).