> Research shows that if interview processes drag on, good candidates lose interest - and go elsewhere

I certainly would! More than one hour of interviewing is a sure sign of a diseased company that probably suffers from massive management overhead, internal conflict resulting in inability to make decisions or someone's complete paralysis out of fear of making wrong decisions.

You'd have to be pretty desperate wanting to start work at such a place. If not, better to keep looking and not waste your time.