"We couldn't find a free WoW process to attach. Please make certain your toon is standing in game world and you are running latest version of Honorbuddy." I get this errror when trying to start the bot, and yes, I am standing in WoW logged into my char.
For example: your key expires on october 3rd. HB is now 10 days down . That means your key will be extended to october 13th.
Also, the time on your key doesn't start ticking until it is actually first used. So if you buy a week key, wait a month - then use it, you will still have 1 week usage from that point.