At 18 I was a pioneer, then appointed a MS. They had me doing everything at the KH. Burned me out, plus I had 3 part time jobs to support myself. I handed it all back to them. Well, I tried to but the elders wouldn't accept it so when the circuit overseer visited I pulled him and the presiding overseer to the side and told them that whether it was accepted or not I wouldn't be doing either anymore. The next week the presiding overseer pulled me in the back and chastised me for embarrassing him.
I knew an elderly brother that was never more than a MS that turned them down many times. I knew a family man that turned down being an elder too for years but he finally succumbed and I believe they ended up deleting him later because his job schedule kept him from being an effective slave anymore.