There is the Hadith: “The first among the doings of a person to be reckoned for on the Day of Judgement shall be his Salaah. A person will succeed and attain his goal if his Salaah is accepted, and he will fail and lose badly if it rejected. If any deficiency is found in his Fardh Salaah, Allah will say (to the Angels): “Look for any Nafl Salaah in his account.’ Then the deficiency in his Fardh Salaah will be made good for with Nafl Salaah. The rest of his religious practices (Fasts, Zakaat, etc.) will then be reckoned for in the same manner.”
I had read that for one Fard Rakaat, 70 Rakaats of Nafl will be required to make up for the Fard. Please confirm this.