I still don't understand why they started issuing interest on HBD which in theory should encourage holding HBD, when their main goal is to bring down the price of HBD to the $1 peg. Now, it seems like it is more about making profits for the stakeholders/platform rather than a peg. I am not really sure.
Crypto is strange. As we speak HBD is still trading close to $2. I will still hold some, just to see what happens.
As far as how long you need to hold to get interest, I have no idea. HP curating rewards would return more than 3% anyway.