Mmmm it took just over a month for Inkys to fully heal and his was all superficial, the hair took longer to grow back but once it did you would never have known anything happened. I'd say his head healed faster than any other cuts etc he's had though.
Horses have a remarkable ability to heal which is probably lucky since they also have a remarkable ability to hurt themselves in a "safe" paddock. Keep an eye on her in case she starts rubbing it as it starts to heal and gets a bit itchy but looks like a "nice" clean wound so should heal well and probably won't scar. Poor girl, any idea what she did it on?
Poor girl and poor you it must be awful to see your horse in that state.
My Dylan had quite a nasty head injury as a baby foal, tore a big flap of skin on his forehead between the eyes, very similar to the lower injury on your mare. Nobody knew what it was from, possibly another mare's hoof but it earned him the nickname 'Zorro' for his gash. Apparently was quite bad and everyone was very scared for him but now he just has a flat relatively small hairless scar. I never realised how bad it must have been until he started greying out from black and now it's more visible except with winter coat you can't see it at all unless you're looking.
Actually, you can kind of see the scar on my avatar pic, next to his eye just above the dark grey patch above the noseband.