According to many religious beliefs, particularly in Christianity, God is often seen as willing to forgive sins every time a person genuinely repents. This notion is supported by scripture, such as 1 John 1:9, which states that if we confess our sins, God is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. Therefore, the most appropriate answer would be:
every time
However, interpretations may vary across different faith traditions.