One mala a day is usually required.
HERE IS THE MARRIAGE MANTRA :
"Om" kaamdevaaya vidmahe
Tannonangaa prachodayaat.This is the Kaamdev Gayatri and is for the marriage of both sexes. I mean a man who wishes to get married can also chant this mantra.There are so many factors that contribute to when a marriage will take place. Do your best, pray, chant your Mantras, and leave the rest in God's hands.
2) The following Mantra asks for a husband, hence it is to be recited only by women. It is meant to attract the right man into your life.
"Om triyambakam yajaamahe sugandhim pativedanam urvarukameva bandhanaanito moksheya maamrutaha"
"3) Katyaayini Mahaa Maayey"Mahaa Yoginya Dheeshvaree"Nanda Gopa sutam"Devi patim mey"kurutey namaha"IN THE ABOVE MANTRA ONE PRAYS FOR A VERY LOVABLE AND UNDERSTANDING HUSBAND."Recite it 5 times daily at least. Once you know it by heart, recite it all the time. Maybe Krishna will come in human form for you."