There is no single answer to that. Different competitions work differently.
Different tournaments last different times. There is also pre-qualifying rounds to enable players to get to the final stages. The World Snooker Championship normally runs for 17 days, but that does not include the pre-qualifying rounds. It is the longest of the main tournaments.
15 red snooker balls.
There are no grey balls in a standard game of snooker.
There are 6 cushions on a snooker table. Each about a metre long.
In the final of the World Snooker Championship it is 18 frames.
In standard snooker 15 reds are used.In six red snooker - no surprisingly - six reds are usedIn power snooker only nine reds are used.
There are 147 points on a snooker table, except fouls pionts.
6
The full name of snooker is SNOOKER.
7 rounds
snooker or biliards
8 legs