Ishraaq Salat

Timings : The way to calculate this was to find the time of sunrise..then after sunrise add 10 to 20 minutes then pray.. 
Rasulullah (S.A.W.W) is reported to have said that Allah Ta'ala says, 'O son of Aadam, perform 4 Rakaats of Salat (Ishraaq) in the early part of the day. I shall help you in accomplishing all your responsibilities during the rest of the day.' (Mishkaat pg.116)
In another narration of Tirmidhi, Rasulullah (S.A.W.W) is reported to have said, 'He who performs Fajr Salat with Jamaat and remains seated in the same place while engaging in Dhikr until after sunrise and thereafter performs 2 Rakaats Nafil Salat, (Ishraaq), he will obtain the Thawaab of one Hajj and one Umrah.' (Tirmidhi).
From the above Ahaadith, we learn that the number of Rakaats to be performed are 2 or 4 Rakaats, and the Mustahabb method of performing it is to remain seated in your place of Salat after Fajr and engage in Dhikr, etc. until sunrise. Then, approximately, 10-15 minutes after sunrise perform 2-4 Rakaats. 'If a person gets occupied in some worldly activity after the Fajr Salat, and after sunrise he offers Ishraaq Salat, this will also be permissible although the reward will be less.' (Bahishti Zewar part2 pg.30)