How many days must I fast if I swore an oath to fast one day upon returning to masturbation, and then I returned to it?

If you swore an oath to fast on a specific day but missed that fast, you have broken your oath and are required to pay an expiation for the oath (kaffarat al-yamin): feeding ten needy persons, or clothing them, or freeing a slave. If you cannot afford any of these, then you must fast for three days. This is based on the Almighty's saying: {Allah will not impose blame upon you for what is unintentional in your oaths, but He will impose blame upon you for what you intended of oaths. So its expiation is the feeding of ten needy persons from the average of that which you feed your [own] families or clothing them or the freeing of a slave. But whoever cannot find [or afford] – then a fast of three days. That is the expiation for your oaths when you have sworn. And guard your oaths. Thus does Allah make clear to you His verses that you may be grateful} [Al-Ma'idah:89]. However, if the oath was not for a specific day, then no breaking of the oath has occurred, and you are required to fast for one day to fulfill your oath.