In order to get the loyalty title Enlightened of Tibia, you need to get 7000 loyalty points. Given that you get one loyalty point per one day of being a premium account, this amounts to 7000 days (around 19 years and 3 months).
The full list of loyalty titles is available here https://www.tibia.com/gameguides/?subtopic=manual§ion=accounts#loyalty I also attach it below. The Savant of Tibia and Enlightened of Tibia titles were added in June 2019 - https://www.tibia.com/news/?subtopic=newsarchive&id=5087
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