If your Twitter account has been suspended then it can depend on why your Twitter Account was suspended to determine how long the Twitter account will be suspended for.
Sometimes a Twitter account gets suspended permanently and other times it's just for a short while.
Some Twitter accounts are suspended for 1 day while other Twitter accounts can be suspended for 30 days to 120 days.
To get your twitter account unsuspended faster you can contact Twitter Support and explain your problem clearly, provide a short explanation of your problem and wait for a response.
You might or might not get the Twitter account back.
If your Twitter account has been banned then you will just need to create a new Twitter account.
If the Twitter account was suspended due to you being underage then you have to wait until you get old enough to get your Twitter account back.