How and when do i pray Salatul Duha (Sunrise Prayer).
Salat ad-Doha is an optional prayer which has according madhhabs a level between mandub and sunnah muakkadah (based on ahadith such as this of abu Hurrairah and this on the authority of abu ad-Darda' and abu Dharr).
The time for this optional prayer is after sunrise and before noon (a possible evidence for the starting time is this hadith from Jami'a at-Tirmdihi and the timing is limited by this sahih hadith).
The most preferred time for it is after the half of the time between sunrise and noon.
The scholars defined this as being when one quarter of the day has passed, i.e., halfway between sunrise and Zuhr prayer.
See al-Majmoo’ by al-Nawawi, 4/36; al-Mawsoo’ah al-Fiqhiyyah, 27/224 . (Source islamqa #22389)
About the amount of raka'a's there's a consensus on the minimum (two raka'a's, based on narration such as this in sahih Muslim) while the there's a dispute on the maximum amount. The Maliki's, Shafi'is and Hanbalis say it is eight raka'a based on ahadith such as here and here in sahih Muslim if one performed more those would be considered as nafl (optional). However some Shafi'is said it was tweleve due to a hadith compiled by imam al-Bayhaqi. The hanafis said the maximum is sixteen raka'a. Othe scholars among them imam at-Tabari said there's no limitation.
As for how to pray it the majority of scholars say one may pray it in two by two sets (as described here in the narration compiled by ibn Majah)and it is also permissible to pray it as four by four sets. ...
Assalamu'Alaykum O Rahmatullah O Barokatuh! The question should be what time to pray salatul Duha. Us after sun rise for example in London is at 07:30 after that time you can start to pray 2 rajah or 4. You can pray by two rakah like the Farj prayer or by 4 rakah like Duhur Asr Isha. All the Salah are the same there is no difference. So you pray in the same way you pray Fard payer. Assalamu'Alaykum O Rahmatullah O Barokatuh! Take care.