| We are wondering if you would like to attempt our code challenge (C/C++ or
| Python). It is a Computer Vision problem which we think can be solved in
| about 8 hours.
I'm afraid I wouldn't, 8 hours is far too much for a interview
problem.
However, thanks for considering my application.
I think it's important to remember that candidates should evaluating the viability of the company as a potential future employer. This seems like a reason to look elsewhere. They do not seem to value the candidate's time (assuming positive intent otherwise).
I'd skip the shenanigans and look elsewhere. I think "thanks, but no thanks" is a good response in this case.
My take on this what they were testing whether I could be pushed around, and I won't be. I'd not want to work at a place that plays those kind of mind-games.