To obtain U.K. settlement (indefinite leave to remain) status all depends on your investment level. When you applied to enter or remain in the U.K. under tier 1 Investor visa route, you would have informed the Home Office how much you plan to invest. Settlement levels depends on whether you invested 2 million, 5 million or 10 million GBP and how you invested your money. You can apply for settlement visa after five years if you invested 2 million GBP, after three years if invested 5 million GBP or two years if invested 10 million GBP. You need to fully understand all the other immigration rules of U.K. settlement based on tier 1 investor route otherwise the application is likely to be refused.
It depends on how much you’ve invested and more information is needed, but as a general rule, if you invested 2 million in the U.K. then as long as you meet the requirements of the investment, English language proficiency, a life in the U.K. test and abscences rule, you can get indefinite leave to remain in five years.