I don't want to imagine a 6-7 weeks injury f
I don't think that's possible anymore.
at first I think BB copied the injury system from hattrick more or less, which made 6 week injuries possible, maybe even 7 weeks.
but then they realised that 6 or 7 weeks in hattrick means only 6 or 7 games, where in BB that's double.
So I think that in the worst case, a 4 week injury might occur. And I also think that if you have a doctor level 3 or higher, this will be 3 weeks max...
I have no solid facts to power this, so it might be wrong. Anyone who has had an injury for more then 3 weeks the last 4 seasons, speak up.

Nevertheless, a 2 week injury already is enough to ruin everything.
The player will be in bad shape when his injury ends, and so he can't be played in important games, so he will not play much, which makes his shape worse. It's a downward spiral, and if you ask me, it's one of the few things that needs improvement in this game.
They are not your friends; they dispise you. I am the only one you can count on. Trust me.