Do you mean applying to ILR in 3 years?
Also can you bring an example on how I can use those 270 days?

Can you please explain how it works?

So 90 days absence applies only to the last year before my ILR application? And 270, 450 days I can divide accordingly... For example 270 days for 3 years: 1y.- 65days; 2y.-115days; 3y.-90days. Is that correct?

Hello, I got BRP card type leave to enter which is leave to remain (the same thing apparently) for 2,5years. I am planning to apply for citizenship if future because I am married to British. I must live in UK for 5 years in order to apply for ILR and then to citizenship. For how long I can be absent ...