How many times will God forgive a person for their sin if they repeat it and ask for forgiveness?

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We can not put a limit on Gods forgiveness.

اللَّهُمَّ إِنِّي أَسْأَلُكَ بِرَحْمَتِكَ الَّتِي وَسِعَتْ كُلَّ شَيْءٍ

O Allah, I ask Theeby Thy mercy, which embraces all things