How to store opened Jägermeister and potential other drinks?

Title is self explaining.
I am not a regulary drinker and actually due to genetics cannot drink a lot (asian flush), so curious enough, I have this bottle of Jäger that I bought, and I drink a grand whole of one shot (which actually that alone is enough to make my ears hear pulsating, althrough I can actually drink up to 10-12 shots without it being an issue, except that I get very red and tired with elevated pulse, so I usually avoid that) during celebrations such as new years, birthday or national day etc.

So the bottle is opened, but I store it in the freezer at all times.

How long can it be stored, since it’s rarely consumed and at this rate might take a year to consume.
Any other good to know things?