7 days for green update is kinda long :/
In fact, new mangas are released every 7 days, which mean some manga will be always green.
I suggest to bring it down to 1 day, such that we know which manga has been updated every day. Therefore, we won't get confused by those of the previous day that are checked already. Because right now i saw a lot of green manga and most of them i have already read In order to know which manga have been updated, i have check the update list.
For new added manga, 7 days sound good so far.