According to people I know 12 weeks would be barely achievable. I think Elviria is a better option, its popular with Spanish and Irish too. Its nearer the airport and all those horrid traffice jams around the coastal access to Benahavis don’t exist. Having stated Elviria its not easy to rent out around there either.
The agents will tell you anything to get you to sign up with them as they know they will at least get a little income. One friend actually owed the agent money at the end of the year ❗