every one is so different, with my first i went from 4-10 in 3hrs but i had an epidural and syntocin.and then a vontuse delivery.
With my second i went from 4-10 in 40mins but i was indused with membranes rupture, no drugs, and was getting 5 contractions every 10mins.
I personaly would try not to worry about it and just take it all in your stride, if you put to much on how you are doing then if your not where you think you should be then you might get disheartened.
Good luck with it all