The Non Imm O visa based on marriage is either 90 days(single entry) or 1 year(multiple entry). You CAN apply to extend either the multiple or the single entry visa for 60 days or 1 year
You'll probably have to live in it for at least 30 years to make it more financially viable than renting, and that doesn't even include maintenance and repairs, something you dont have to worry about if you rent!