If you buy it, you are entitled to BOGO free for the maximum you can buy. Pay 12 and get 12 free.
Since you have more than one membership, your husband can also buy it and once he does, he will unlock that benefit for himself but his would need to be on a different membership since the maximum of 24 per UY doesn’t matter
Now, I believe that owners who have just one membership might be able to capitalize for 2025, if their UY is earlier in the year.
For example, someone with a Feb UY joins, and buys them for a trip in the Feb 2025 UY.
The other owner buys into the program and buys their entitlement for a trip in the Feb 2026 UY.
As long as you are purchasing them in 2025 when you are part of the program, the trip can take place in calendar year 2026.
Because this benefit is per person, and the enrolled member needs to be present for things like the extra lounge hours, character greets, and priority lounge waitlist, there is a valid reason why more than one person in a household would buy since some do travel without the other.