30 year - 35%
I like to think long term, but who would lock their HBD literally for 30 years? I mean, if you have so much HBD that you do not even need it, just/only its interest, then it is fine.
Maybe you will not even live for that long. So what if you do not even live for 30 years from the time of locking?
I currently have only one idea about this. Building a savings account for your child/children.
https://www.finra.org/investors/learn-to-invest/types-investments/bonds/buying-and-selling-bonds
You don't actually have to hold a bond to maturity. This is why there would be HBD30 tokens.