Do you work 12 hours a day?

No, not since I retired.

Yes I do 12 hour shifts 

no                 

At my last job, I worked 12 hour shifts. 

I do often, or longer during Summer, but only then.

Sometimes, night duty is usually longer though.

Or more.......

I have done in the past

Some days I do.  But mostly no.

I am freelance and co-own a small business.  If I work both in a day it easily gets to 12 or more hours.  I try not to do that too often.