How many times post to forgive?

Peter asked Jesus, in Matthew 18:21, how many times he should forgive his brother. Peter thought he was being generous when he suggested seven times instead of the three times required by Rabbinical law. Jesus said either "Not seven times, but seventy-seven times" or "Not seven times, but seventy times seven," depending on what version or translation of The Bible you use for reference. Either answer (77 times or 490 times) was to mean Peter and we should forgive our brothers as many times as they need to be forgiven. The parable Jesus told to illustrate His answer makes it clear that human beings have no right to hold grudges or to be unforgiving. (See Matt. 18:23-35)