I've said this before, and I don't mind rehashing it here. It isn't meant as a personal slight in the least, your priorities are yours to have, but as someone who does hiring, I do not operate under any desire to keep interviews short for that exact reason.
If my interviews are a waste of your time, then you aren't likely to be the guy I want to hire. I want to hire someone who wants to work for me for more of a reason than to collect a paycheck. I want new hires to believe in our purpose, to fit in with our team, yadda yadda, but ideally, I'd like our interview candidates to actually _want to work_ for our company because they like or admire it independently of whether or not they are collecting their checks from us.
Perhaps I'm biased, but that ideal candidate, in my mind, doesn't consider an extended interview a waste of their time.
If my interviews are a waste of your time, then you aren't likely to be the guy I want to hire. I want to hire someone who wants to work for me for more of a reason than to collect a paycheck. I want new hires to believe in our purpose, to fit in with our team, yadda yadda, but ideally, I'd like our interview candidates to actually _want to work_ for our company because they like or admire it independently of whether or not they are collecting their checks from us.
Perhaps I'm biased, but that ideal candidate, in my mind, doesn't consider an extended interview a waste of their time.