What is the time frame for Sunan (Sunnah prayers) performed before the obligatory prayer?

Chapter on the Times When Prayer is Prohibited

Al-Mughni

Book of Prayer

Book 3 · Issue 1 · Bab 9

Open in Qurani

Primary text

The time for a Sunnah prayer performed before an obligatory prayer begins upon the commencement of the obligatory prayer's time and concludes upon the performance of that obligatory prayer.