If someone is tamei, does that person have to use the mikvah twice or once is enough? If you have to use it twice how is this done?
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Firstly, the Rambam in הלכות מקוות פרק א says:
"Somebody who immerses twice is reprehensible." So it's clear that you never have to immerse more than once.
Secondly, there's no obligation for men who are tamei to go to a Mikvah nowadays.
As a result, your question "does that person have to use the mikvah twice or once is enough" is based on a false premise.
The correct answer is: If someone is tamei he doesn't have to go to the Mikvah at all.