Firstly, I think it would depend where you live- if you live somewhere like Malaysia it would probably take longer than in the UK, by the sound of things.
Secondly, it really can vary. My friend had to wait over a month for her grade 7 flute results in the summer, but I got my grade 7 piano results after 6 days when I took the exam last March.
I'm sure they will come soon... be patient!