Sunnate Muakkida (Emphatic Sunnah)

The last decade of Ramdhan means he will stay in mosque from 20 until the evening of 29/30 /Ramdhan before sunset stay. There is no limit of recommended Sunnah. Namely a day, 2 days, may be 3 etc.  In Sunnate Muakkidah (Regular retreat will be conditioned by continued fasting.