Question

If I push on a wall with a force of 3500 N for 5 hours but the wall does not move, how much work have I done.

Answer 1

#1). Work = (force) x (distance)
Since the distance is zero, the work is zero.

#2).  But I've still gotta hand it to you in a big way.
There aren't many men who can push on a wall for 5 hours
with a force of nearly 790 pounds ! !   Work or no work.