I turn down interviews that end up being >4 hours. When you get to a senior engineer level, these interviews cost hundreds to thousands of dollars of our time.

I turn down interviews that end up being >4 hours. When you get to a senior engineer level, these interviews cost hundreds to thousands of dollars of our time. Often times technical performance doesn't get you a job, it just keeps your from losing the job. The decision is heavily dependent on how well you got along with the hiring manager and what type of mood they're in when they meet you. If you're unlucky, you'll flounder on one of the esoteric algorithm questions that have little to no correlation to your performance at the job. In this case, you've entirely wasted your time.