The only question is for whom. How will you find the missed number?” Mechanical turk. “Are you willing to work on your feet for ten hours, four days a week?” Probably, but labor laws prevent you from dictating those terms so I’ll pretend I didn’t hear that. “Do you think you’ll reach a point where you storm off the floor and never return?” Yes.
And you can run for a while at over 100% but not indefinitely.
The task of a good manager is to run an employee up to the point of the Mental limits and make sure all those other limits are at 5% so they can maximize the employee output. Every time you push the employee at 150% for 2 days, you need to let them recover at 75% for 4 days.