i understood what you mean but i didn't say that your sentence was definitely wrong , there are two ways to get meaning of your sentence , check my explanation again also speaking english more than 15 years doesn't make any sense to me
i see
you didn't say that my sentece is definitely wrong but what did you mean?
baştan fail biri translateden yapmak?!
Ek Olarak: that was my answer
"i've been speaking english for more then 15 years"