Hi Ryan,
I would think 2 1/2yrs is about right for the grade you are at.
Anyway, it isn't the grade that matters. What matters is that you enjoy what you are playing and build up on lots of different music over time.
Try some of your favourite pieces alongside grade work.
It doesn't matter at what level. If you complete a piece you really like, you feel brill !
It also makes you realise what you are playing an instrument for - which isn't necessarily grades !
I may only be GII /GIII but I have completed a few Grade V - VI pieces because I love them
After all, whats the point of having Grade VIII if you can only play 24 exam pieces ?
Fiona.