One day extra would be better depending on where you are going to fly after hair transplantation. In 9 days, you would get bored with stacking up in a hotel room.
I think if you meet somebody new, she will criticize the hair loss. But if she is already dating you, then, she will seem to not care. But in reality she does
As far as I know the redness depends on the skin color. If you are really white, duration lasts longer. However, for the brown guy, the redness is gone quicker.