Three days wasn't enough to fix every mech.
Even if he stopped going to bed and jacked himself up with stimulants, it was impossible for Ves to complete all of the tasks within 72 hours!
"In fact, I still won't be able to finish all of the repairs within a week!"
A lot of repair tasks were so extensive that the procedure was no different from fabricating a new mech from scratch!
"That's only in case I want to restore my dueling mechs to their peak condition."
If he lowered his standards, then he could do a serviceable job in just a fraction of the time. He just needed to make sure that his sloppy rush jobs didn't fall apart when put to the test.
This was still a great test for any mech designer. They had to employ great planning, judgement and other necessary skills. A mech designer would never be able to achieve success in the mech market if they weren't capable of working efficiently.