How much of your salary is used to repay the student debt?

just out of curiosity how much of your salary goes to student debt repayments? as I recently changed my base salary for the better, my student loan repayments increased too and now i really start to get p$$d off by how much goes into it 

I also have another one fixed for additional 2y and a half.. don't know whether to stretch that one or continue paying it and hope to escape asap from its repayment 

overall I would say around 1/4 of my salary goes to student debt repayments