We just completed a renovation of our master bathroom recently and were lucky enough to work with a contractor who was very organized and showed up every morning at 8:30am like clockwork. I work from home, so it was important that the process not drag on longer than necessary and his organization was key. Also essential was me knowing what had to be ordered in advance (vanity, tile, etc.). Our bathroom reno (which was a total gut job) took exactly 3 weeks to complete.
Here is a great article from realtor.com that explains how long a kitchen renovation is likely to take and how to survive it.