What is the time span between eating Sahri before the dawn prayer and the observation of prayer according to the Prophet Muhammad (saw)?
 Zaid b. Thabit (Allah be pleased with him) said:                      We took meal shortly before dawn along with the Messenger of Allah (may peace be upon him). We then stood up for prayer. I said: How much span of time was there between the two (acts, i. e. taking of Sahri and observing of prayer)? He said (a span of reciting) fifty verses.