How long can you grind?

i used to be able to go like 15 hours a day but then 4th job came out and now im expected to blizz all the time so being able to sit and press 2-3 buttons at newts wud be really boring - blizz blizz pot blizz pot blizz pot blizz blizz i felll ~walk up blizzz- not something i wanna do but yeah if im able to do "melee" which is what i consider using ifrit id cl and is all the time im sure i can go a long time without stopping =p

~Failed Blizz20 twice~