This is not really a problem, but I still don't feel satisfactory.
I started a question, and then put a bounty on it. One answer showed a way to solve my problem, put the answerer can't explain how it works (kind of "magic line of code"). I'm waiting and hope for a better explanation.
But as the deadline for bounty draws near (about 1 day), I fear that I maybe too busy to give the bounty: at least the answerer helps me to solve part of the problem. So if there's no other response, I should give it to him.
But I also notice that only the near-deadline questions are on the top of the feature question list. So the nearer my question comes to deadline, the more it will receive notice. It means I'll get better hope for a better answer.
This paradox troubles me. Is there any way to resolve it? Or if it's the rule, what is the best time to give bounty to "acceptable answer"?
SUMMARIZE: My question maybe not clear enough. I want to ask about how long I should wait before granting the bounty (in case there's no helpful-enough answer yet). Because as I see, the longer I wait, the more notice my question will get. But that also create risks that I maybe busy on the day the deadline is due.
UPDATE: Up to now, it seems that my best option is trying to wait as long as possible after setting the bounty, and self-control the schedule to review it. Thanks for all advices.
About my bounty question, I take the remaining problems out and create another smaller question. I think that's also an acceptable way.