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Yes sure .
I have a feeling you are referring to old rules. Perhaps you are thinking of the old rule relating to having been married for 4 years, often applied for from outside the UK and resulting in a Spouse KOL Required visa. I think you have also got this from old posts on either forums or commercial sites that are not updated.
Current rules relating to settlement based on marriage to a British Citizen can be found here:
This clearly states that the Spouse visa route requires a period of 5 years in the UK under that category - this means 5 years in the UK holding a Spouse visa.