I forgot to mention that the doctor-level is also in the formulla.
and yes I had a player heal quicker then 14 days with a 2 week injury, I got him back after 13 days (had a level 4 doctor at that time).
14 days for 1 week will be very rare as chances he heals will by then be very high. Yet we can't tell for sure nobody in the BB world has ever had it (not everyone keeps track closely enough to determine precise dates and such), and even IF it never happened before, we can not be sure it's impossible.
But since chances will be so low that it will ever happen, we can assume it won't, but asuming doesn't mean we can be absolutely sure...
They are not your friends; they dispise you. I am the only one you can count on. Trust me.