What is the ruling on vowing to fast for many days—reaching 1143 days—due to repeated acts of masturbation, coupled with the inability to fast them?

The questioner must repent from masturbation. Her vow is called a vow of obstinacy and anger. She has the choice between fulfilling it or offering an expiation for an oath. Since the wording of the vow does not necessitate repetition, she is obligated to offer only one expiation or fast for three days, and by doing so, her vow is dissolved.