At what point during approach towards an airport does the pilot get off autopilot. I watch several cockpit videos on the Youtube and it seemed to me that some pilots (including foreign air carriers) don't get off autopilot until close to landing. At least that's what I observed on the cockpit videio of a Lufthansa B747 landing in Frankfurt.

From my understanding, it would depend on the approach. While a normal approach I would figure the autopilot to be turned off when the pre-landing checks take place. At least, for the Piper Seminole, that's when it is made sure that the autopilot is disconnected. But an autopilot is used to perform a CAT III approach, there's certain specifications for that though. I think it's something like, there needs to be three autopilots for that sort of approach, then again, I'm just learning multi-engine stuff, so... don't quote me on anything.