Does the free 6 months for Apple Music work for a second time on the same Apple ID account?

My mother got herself the AirPods (2nd Gen) and I did the set-up. I saw the free 6 months and asked if she wanted the trial which she said I can use it cause she doesn’t need it.

So I redeemed it with my apple ID and I’ll have Apple Music (i’m a first time user) for 6 months. If I buy another set of AirPods for myself after this 6 months

Do I get another 6 months? Or it is just for first time account users?