How long do I have to stay in the UK every year before I can stay permanently?

As for the length of permanent residence in the UK each year, the situation is as follows:

1. Under normal circumstances, you must leave the UK for more than two years before you lose your permanent residence status.

2. Exemptions may be granted under special circumstances, such as conflicts, serious illness of the applicant or close relatives, natural disasters, visa holders of skilled workers who have been guaranteed to engage in doctoral-level occupations, and overseas work of some full-time British reservists.

3. Some individuals can obtain settled British citizenship without applying for indefinite residence, such as those who are eligible for British citizenship (or other forms of automatic citizenship) by descent, family members of children of British citizens or people with settled status, adult dependents who rely on long-term care for British citizens or family members with settled status, and refugees who have resettled in the UK through the Gateway Protection Scheme.

I hope the above information will help to answer your question.