All the canteens are invariably open from 2 PM to 2 AM. Yes, your read that right, 2 AM. This is one of the reasons many of the students have turned into night owls after coming to IIT Kanpur.
Canteens usually adopt a credit system so that a student doesn't have to pay in cash every time he/she has some food in the canteen. Instead, the amount gets written to his/her account. The cumulative amount can then be repaid by the student at a later date, without interest!
There is a television set up inside the canteen for everyone's (or sometimes just the canteen workers') entertainment. When an important cricket or soccer match is going on, the canteen is packed to the core. Thus, it also plays the role of a sports bar sometimes.
Hall 4 canteen is the most popular hall canteen in the campus. It is one of the most crowded places during dinner time which is why it takes around 20 minutes for an order to be served.