How long does Tet last for?

Excuse me, as a practitioner in the field of cryptocurrency and finance, I'm often fascinated by cultural phenomena that may intersect with financial trends. I've heard a lot about the Tet holiday, which seems to be a significant cultural event in certain regions. Could you please elaborate on how long the Tet festival typically lasts? Is it a short celebration spanning a few days, or does it extend for a longer period, perhaps even weeks? Your insight into this cultural aspect would greatly assist me in understanding how it may potentially influence financial markets or consumer behavior in those regions. Thank you in advance for your time and consideration.