There are different game duration on chess.com. What do options 1|1, 2|1 etc. mean?
For example 3|2 means each player starts with 3 minutes and gets 2 seconds added to the clock for making a move (this is called an "increment").
When there is no "|", you do not get any time for making a move, and each player gets the displayed time in minutes at the start of the game.
Another notation you might see uses a "+", for example 3+2.