A common question asked is, “How long do tournaments typically take?” After a lot of research, I made this handy little table, with the approximate average lengths in minutes, given how many players are in the tournament.
There are 4 kinds of tournaments, as shown in the table below. Some require 6 players to start, some require 4. All your games will be pre-decided by the server.
I am constantly updating this table, so this may change.

Disclaimer: This is assuming players are not disqualified and do not resign from the tournament. A rule of thumb is to subtract 7 minutes for every player disqualified. (The way a player gets disqualified is by timing out before making a move.)

It's not a very good rule of thumb. More like a rule of pinky finger. Those are pretty weak, and half the promises they make are broken.

Wow if twenty people join a live Swiss tournament and I am in it I have to be online for five hours and twenty minutes and couldn’t do anything else except a small break between games maybe 5 minutes of video games or maybe eat some chicken nuggets or go to toilet.Is there a way this tournament will happen ?Only if twenty people join.Any formula for doing this math?i am too last to find the formula but I sure do want to find out how many minutes does it take for various numbers, or is this a pattern?Also staying on a birthday party when they are singing the song is disrespectful and I did that once before because a live tournament lasted about four hours and stayed on for about 6-7 hours