[andrewingram]

I did one that was time limited (2 hours, automatically timed and enforced). The exercise wasn't hard, but it did have some tedious quirks which meant I wasted quite a bit of time. But I thought "fine, I can jump through this 2 hour hoop". After I submitted it, it turned out there were some previously undisclosed extra steps where I had to record videos doing the kind of things i'd expect to do in an actual interview (talk through my solution, and talk about a project I'm proud of). I immediately lost interest.