In Jesus' parable, how many years had the owner looked for fruit on the barren fig tree?

Answer: Three

For three years the owner found no fruit, but the vinedresser asked to fertilize it and give it one more year.

“So he said to the keeper of the vineyard, ‘Look, for the past three years I have come to search for fruit on this fig tree and haven’t found any. Therefore cut it down! Why should it use up the soil?’”— Luke 13:7 (BSB)