I think you need to read the rules carefully, BM has the authority to change the rules if needed.
Isn't 7 days more than enough to complete the requirement?
Some bounties can change the rules if needed so be prepared for that and i think you need to be in the group at least once a day. They will give you some time for any kind of complaint, so it is better for you if you are always present in their group.
it is true that the existence of a group is to monitor the latest news, so I think we should always pay attention to this. most of us always underestimate this so when the rules change we always deny BM without checking for the latest updates.
I cant really blame people to neglect most of the time when it comes to updates since we know on how bounty hunting turns out to be a shit.
They do just join and then when its over then they do jump into other projects as simple as that. Some do think seriously on rewards and some are just
taking these bounty jobs lightly without minding if they would be paid up or not. Its really devastating when you do missed out some news about
the bounty specially if the coin is listed on an exchange, there are swaps or forks do happen etc.