Is your spouse eligible for ILR in the UK? They are usually required to have been in the UK for five years or more with a valid spouse or partner visa. No record of immigration offense and the relationship would need to be genuine. The process of applying for settlement – This requires filling out forms, producing documents, and attending biometric interviews on another visit. The whole process can take anywhere from several months to well over a year. Financial criteria, including a minimum income threshold, may also need to be met. With ILR, you will be able to freely reside in the UK and work in the country. After one year, the spouse is eligible for citizenship in the country.
https://www.oasis-india.com/is-your-spouse-eligible-for-ilr-in-the-uk/