Chaldean Minute

The act of telling someone or something one timeframe - and not delivering or showing up at least 3 times the given amount.

Chaldeans are notorious for underestimating time.

Steve: "Hey guys I am going to boof before our next game, give me 10 minutes"
Brycen: "I guess we have to wait 30 minutes for this guy... Chaldean Minute."