[khazhou]

I could easily be wrong but I didn't think he meant the engineer literally worked 48 hours without sleep or rest, then literally slept for 48 hours. I took it as: the engineer regularly shut out everyone for ~2 days straight and did long, extremely focus coding sessions, then shut out all work for a couple of days to decompress. Taken that way, it's not bi-polar or mental-health issue at all. Seems like this engineer just had the guts to stand up to everyone's ordained-from-the-heavens schedule of interruptions: "I'm gonna ignore distractions for two days to work, then ignore distractions for two days to rest."