Witr and Nawaafil

Time for Tahajjud Salaah

Q: My question relates to the times of Tahajud. When i was in madressah I was taught that we could read from just after 12am till about 15min before fajar salah. Recently I was told many different things regarding the times. What would be the right time to read Tahajud salah and the cut off time?

Salaatul Istikhaara

Q: I would like to know if it is permissible to recite Salaatul Istikhara even if you only intend on marrying the desired person after a couple of years. I have heard that after reading the Salaah then nikaah should not be delayed. Please can you also tell me more about the Salaatul Istikhara that is read on a persons behalf, also what are the conditions of that Salaah?