It really doesn't take long to learn, especially if you hang it in key places where you'll see it. One year, one of the novices hung it on the door of the medicine cabinet in the bathroom. (We don't have mirrors in the bathrooms so she couldn't hang it there!) After a few days of brushing your teeth you'll have it memorized in no time!
Hail and blessed be the hour and moment in which the Son of God was born of the most pure Virgin Mary, at midnight, in Bethlehem, in piercing cold. In that hour, vouchsafe, O my God! to hear my prayer and grant my desires, [here mention your request] through the merits of Our Saviour Jesus Christ, and of His Blessed Mother. Amen.