If a Player is sent off, it is a matter of fact the Player will be suspended 14 days after the date of the game, as set out by The FA in the Discipline Handbook.
The length of ban depends on the type of misconduct:
Serious Foul Play
3 match suspension
5 penalty points
Violent Conduct
3 match suspension
6 penalty points
Spitting at an opponent
6 match suspension
7 penalty points
Denies an obvious goal scoring opportunity by an offence punishable by a free kick or penalty kick
1 match
3 penalty points
Denying an obvious goal scoring opportunity by deliberately handling the ball
1 match
3 penalty points
Use of offensive, or insulting or abusive language
2 matches
4 penalty points
Receiving a second caution in a match
1 match suspension
3 penalty points
You can read more about misconduct charges in the Discipline Handbook which can be found by using the link below:-