Hadithcore
Hadith #2105310

And in another:

"fifteen days."

وَفِي أُخْرَى: { خَمْسَ عَشْرَةَ } .‏ [1]‏ .‏

References2 variants
Sunnah.com reference
Book 2, Hadith 347
Arabic/English book reference
Book 2, Hadith 0