I don't know if it's just me, but I just stumbled over some bounties on SO, which, at first glance, looked like bugs to me. The questions, the bounties were offered for, are dated back to year 2009.
The block
This question has an open bounty worth +50 reputation from User ending in 6 days.
below the question made me think "Wow, a bounty running for nearly 2 years?! Is this a bug?".
Without searching the SO FAQ and finding the setting bounties entry (which is somewhat hidden within the "What if I don't get a good answer" block), I still wouldn't know that bounties (at least on SO) always expire after 7 days.
Hence, I still would think of bugs (and probably "I guess there won't be much users willing/motivated to answer bounties running for such a long time...").
Wouldn't it be better to show the bounties starting date somewhere (e.g. in the bounty block below the question) to avoid such kind of misinterpretation/irritation?
I mean s/t like this
This question has an open bounty worth +50 reputation from User ending in 6 days (bounty started at YYYY-MM-DD).
or
This question has an open bounty worth +50 reputation from User, started 1 day ago, ending in 6 days.
or whatever would help right away.