How about adding how long till the bounty expired in the list of questions with a bounty?
I am aware that you can see the expiration time when you click the question, but this seams better way to get it.
Sort by shortest time left (if it doesn't already say this) and add a simple HH:NN similar to the # of views somewhere. Not cluttery at all.
I don't like this change because I think it creates to much noise on the list of questions. Especially since it is in red.
In my opinion the number of days and hours before a bounty expires is not very important in deciding which featured question to put an answer down for. If you have an answer, post it.
I suggest this change doesn't get made.