My immigration is marriage based... what I would like to know is?.... when can I apply for citizenship? is it 3 years after I first applied or 3 years after they granted me the 10yr gc ?

3 years after you become a permanent resident (conditional or not, does not matter). There was a date on GC: resident since XX.XX.***X

that's under the condition you meet other requirements

Why do people keep asking this simple question?

Simple things for simple minds.