I thought I should share my experience for people out their. Citizenship applied 29th of April via post. Fees deducted 5th of May contact detail letter 11th May citizenship approval letter received 19/06/20 letter dated 15/06/20. Applied 4 years and 10 months and been on holidays for about 2 months on the first year and been on holidays for a month on 5th year. That should clear some confusion for anyone asking if they have to wait for 5 years to apply or they can apply earlier.