3 week old... how long can he sleep for?

Cassie • 25 ♊️ | MMC Jan 2018 👼🏼 | mama to Nathan 06.06.2019 🌈

First time mom here! How long can my 3 week old sleep?? During the day he normally wakes on his own ( if not I’ll take him regardless and put him on the breast) every 2ish hours to eat sometimes even less and sometimes he’ll go until 3 hours but what about at night? How long can he go at night without me waking him up? I’ve read and heard 4-5 hours but I’m not too sure... can anyone give me some advice please. Thanks in advance!