When you upgrade your buildings with the Ambulance Cart, it says "lowers the risk and recovery period for mild injuries, like strains"

My players got a Hamstring Strain, Grade 1.... FOUR ****ing days! How is that lowering the recovery period? hamstring strain grade 1 for four days is a LONG LONG time!
I dont think that these ambulance cart upgrades and stuff does any real impact, it is just there for show.