Month

The triliteral root ʿshīn hā rā (ش ه ر) occurs in the Quran 21 times.

Thirty months

(46:15) We instructed the human being to honor his parents. His mother bore him with hardship, gave birth to him in hardship, and his weaning lasts thirty months (Arab. شَهْرًا, shahran). Until he has attained his maturity, and reaches forty years, he says: "My Lord, expand my abilities to be thankful for the blessings You have bestowed upon me and upon my parents, and to do righteousness that pleases You. Let my progeny be righteous. I have repented to You; I am of those who have peacefully surrendered."