 Hence, there has been an increased discussion on whether there is a maximum length of a fast, including many schools banning fasting for children.al-Shirazi holds a distinguished ruling to this, where his rationale is to change the length of the fast to a maximum of what is "normal" and there is no need to repeat the fast.His view is a minority ruling, only shared by Sheikh Nasser Makarim Shirazi (in a slightly different version) and a few other jurists.