Tenerife was the last island to be conquered and the one that took the longest time to submit to the Castilian troops. Although the traditional dates of conquest of Tenerife are established between 1494  and 1496 , it must be taken into account that the attempts to annex the island of Tenerife to the Crown of Castile date back at least to 1464. For this reason, from the first attempt to conquer the island in 1464, until it is finally conquered in 1496, 32 years pass. In 1464, takes place in the barranco del Bufadero taking symbolic possession of the island by the Lord of the Canary Islas Diego Garcia de Herrera. This signing a peace treaty with menceyes, allowing shortly after mencey Anaga build a tower on their land, where Guanches and Europeans had treatment until it is demolished around 1472 by the same Guanches.
Question: How many years passed between the first attempt to annex Tenerife until the actual conquest began?
Answer: 30