Duha is a voluntary forenoon prayer. Its minimum is two rakʿahs; Muslims may pray more according to the recognised voluntary-prayer guidance.
When to pray Duha
Its time begins after the sun has clearly risen above the horizon and continues until shortly before the sun reaches its zenith before Dhuhr. Exact clock-minute formulas vary by location and season, so this page no longer states “20 minutes after sunrise and 15 minutes before Dhuhr” as a universal rule.
Its virtue
In Sahih Muslim 720, the Prophet ﷺ taught that acts of charity are due for the body’s joints and that two rakʿahs of Duha suffice for that.
Fiqh note: Duha is a recommended voluntary prayer. Jurists may use different technical labels for its level of recommendation, so the site avoids implying one school’s terminology is the only Sunni formulation.