[ldite]

I don't turn them down - bridge burning is for pyromaniacs - I just make non-committal noises and don't usually get back to them.

I should clarify that I was thinking more of outfits that respond to my enquiry with "Hi $candidate, please do this generic exercise after which we'll deign to look at your CV". Bonus points awarded/deducted if the requested exercise is for something already available on my github profile.

And 4-6 hours is typically my free time (not free computer time, total free time) for a week.