Your mental state will deteriorate and although you won't notice any apparent effects, the rest of the world will be telling you to take some time off, and you won't be able to read their lips.
It will seem like Destrektors lucid dream state.
I once worked on an album some 63 days in a row until I got sick and collapsed. Then he brought in a second engineer. Messed me up for a couple of weeks afterwards.
Don;t do it anymore, I'm too old. It's like partyin'0, can't do it like the old days, takes too long to recover.