The UK spouse visa for the United Kingdom permits a foreign partner of a British citizen to join that spouse in the United Kingdom. The applicant must demonstrate that he or she has a genuine relationship and also meet financial criteria. This includes the fact that the UK spouse has an income of at least 18,600 pounds per year. Conclusively, the applicant may also need to evidence their English language competence. A duration of 30 months is the standard period of UK Spouse visa usually leading to indefinite leave to remain ILR after 5 years of residence in the UK allowing for both partners to establish life in the UK.
https://icslegal.com/uk-spouse-visa