A problem of time complexity

Please help me!
How should I analyze the time complexity of a optimization problem tackled with CVX?
How can I find number of cycles when I deal with a optimization problem with CVX?
Or how can I estimate how long does it take to solve an optimization problem with CVX?
Is the time CVX use relevant to the constrains and objective?
I am in a hurry to get an answer, thank you very much!