'Often' in the Bible

Then John's disciples came to him, saying, "Why do we and the Pharisees fast often, but your disciples don't fast?"

"Lord, have mercy on my son, for he is epileptic, and suffers grievously; for he often falls into the fire, and often into the water.

Then Peter came and said to him, "Lord, how often shall my brother sin against me, and I forgive him? Until seven times?"

"Jerusalem, Jerusalem, who kills the prophets, and stones those who are sent to her! How often I would have gathered your children together, even as a hen gathers her chicks under her wings, and you would not!