Then Peter came to Him and said, “Lord, how often shall my brother sin against me, and I forgive him? Up to seven times?”
Jesus said to him, “I do not say to you, up to seven times, but up to seventy times seven.
The Talmud, the rabbi’s commentary and teaching on the Law, stated you should forgive a person sinning against you three times.
Perhaps Peter thought he was quite generous.
I believe Jesus invoked the Law of the Shemmitah in His reply.
A shemmitah is the release of debt and rest of the land that takes place every seven years. (Deut 15:1, Lev 25:2-4)
So Jesus is not talking about 490 times (70×7) but 490 shemmitah’s or 490 years, which is more than your lifetime.
The lesson here – forgive others your entire life!