There’s no zone that is totally permanent. That is totally non-permanent and there is no distinction line between the two zones. Surgically speaking, if hairs are taken from the less permanent zone they won’t be permanent or some of them may not be permanent. If most of those hairs are taken from the most permanent zone they will be most permanent.
The duration of a hair transplant depends on the number of grafts transferred as well as the care given by the surgical team on each surgical manipulation and lastly the difficulty of each individual case. Since usually the limits of a surgical day are used to transfer the most number of grafts, an average session takes the whole day and is about 7-8 hours.
Depending on each individual case, a hair cut may be possible 3 weeks after a hair transplant. A guarded trimmer could also be used 3 weeks later. However, razor-shaving should be avoided after a hair transplant which could be harmful.
Transplanted hairs are the patients hair and they behave no differently than the non-transplanted hairs. When done professionally, a transplant should look as natural as non-transplanted hair and any hair style should be possible.