HD accounts keep their awards until they are purged.
For those asking what the old Policy 7 said, here it is,
If you do not post on the forums for 60+ days regardless whether you casted rollcall, regardless of what rank you hold, your account will be flagged inactive and deleted. The only exceptions to deletion for inactive accounts are those on official leave of absence when an admin manually flags the account to be on leave thus making it non-deletable If a new member registers, gets approved and does not post within the first 10 days, it will be flagged as abandoned and deleted. If an account resides in the approval queue for 10 days it will be rejected and deleted.
We strive to ensure our registered members stats reflect the true number of active members within our community. We do not keep old accounts for any reason. Resigned and banned accounts also fall into this category and after 60 days are deleted.
As you can see in the LOA section of Policy 6, accounts are purged at 120 instead of 60. Everything else in here was redundant and address in the new Policy 6 other section.