Originally Posted by Samuel
I thought it was only 5 or so on that show?
It used to be, then the NX-01 got sucked into a wormhole and got stuck in the past, and then an alternate universe was created. Then the NX-01 in the alternate universe past went back through the wormhole and encountered the Prime NX-01 in the present(during the show) and gave the Prime NX-01 the technology to reach Warp 7.
It's a really confusing episode.