I should rephrase. I think a full-day interview for a startup is probably going to be a waste of time. After I've already passed a pair of phone interviews for

I should rephrase. I think a full-day interview for a startup is probably going to be a waste of time. After I've already passed a pair of phone interviews for a company with very high comp like Google, Apple, etc? I'd do a full day. For a startup? Meh. As another poster mentioned, there is no silver bullet. Companies should be flexible and not feel bound to doing it exactly the same way that the big companies do (and even those could be more flexible, but who am I to tell them how to operate) - your startup does not offer the same things or have the same needs, you should not interview the same way. After all, we're expected to be flexible too (take time off work, do phone interviews, hour long onsite interviews, multiple interviews, homework, and/or day long onsites - apparently we're supposed to be happy to do any of those for multiple companies at a time!).