Bit of a discount, and you can skip months to string it out - my last annual subscription lasted three years.
You can add this to your account as an existing member, per the FAQ:
https://support.humblebundle.com/hc/en-us/articles/313462861…
General Humble Choice FAQs here:
https://support.humblebundle.com/hc/en-us/articles/360036284…
Great, I do this each year now instead of paying month to month. Thank you.