I need to know how it takes after drinking alcohol to not show up in a test if a person is on probation and required not to drink.

Well first no you should not worry about it, since if you were following your rules then there is no worry is there, if you are violating the terms of your probatoin, and not worried about some friend getting mad and reporting you, some ex person you were dating reporting you, or getting caught in some place with the drink to be reported.

But then how much are you drinking and is it a UA or hair test.

You should be safe in 48 to 72 hours normally