There are five times prescribed for the daily namaz. [They are as follows]:
The first time is from dawn to sunrise [and is known as Fajr]. The namaz comprises two rak‘at [which are obligatory and performed in congregation] and is preceded by an individually performed namaz also of two rak‘at.
The second time, [Zuhr], begins from when the sun passes [the Meridian] and lasts approximately three hours. The namaz comprises four rak‘at [which are obligatory and performed in congregation] and is preceded and followed by two individually performed namaz of four rak‘at each.
After this the time for Asr starts. The namaz comprises four rak‘at [which are obligatory and performed in congregation].
[Maghrib is the namaz] performed immediately after sunset and comprises three rak‘at [which are obligatory and performed in congregation] followed by an individually performed namaz of two rak‘at.
From approximately an hour and a half after sunset the time for the fifth prayer begins which is known as ‘Isha’. The namaz consists of four rak‘at [which are obligatory and performed in congregation] followed by two rak’at and three rak‘at respectively. The time for ‘Isha’ lasts until midnight.
Besides the [specified five daily prayers] Muslims are advised to perform four units of namaz comprising two rak‘at each between midnight and the break of dawn. This service is referred to as tahajjud and is not obligatory (on every Muslim). Whosoever wishes to perform it may do so.