The tradition, (of the Prophet) is that if someone marries a virgin and he has already a matron wife (with him), then he should stay with the virgin for seven days; and if someone marries a matron (and he has already a virgin wife with him) then he should stay with her for three days.
Sahih al-Bukhari Book 67, Hadith 146
← Previous Hadith Sauda bint Zam`a gave up her turn to me (`Aisha), and so the Prophet (ﷺ) used to give me (`Aisha) both my day and the day of Sauda.

Sahih al-Bukhari Book 67, Hadith 145 Next Hadith → It is the Prophet's tradition that if someone marries a virgin and he has already a matron wife then he should stay for seven days with her (the virgin) and then by turns; and if someone marries a matron and he has already a virgin wife then he should stay with her (the matron) for three days, and then by turns.

Sahih al-Bukhari Book 67, Hadith 147