I have had uneven growth pattern, and my huge improvement came after 7-8 months. But even during month seven, I could feel hair follicles sprouting if I rubbed my scalp with finger gently.
If you run your finger against your scalp and still not able to feel any new graft coming through, it is a concern. At 7 months you may not see final result, but you should be seeing additional grafts coming through.