When i quoted those times I was going by what my buddy told me. I don't have a guage on my bike. The times for the last sprint could be a little less. They felt like they took forever.
I enjoyed the trails much more than the road path portions of the trip. Once we got deep into the trees I found it harder to breathe, and thats when we stopped more often. The 2 guys I was riding with were on $1k+ bikes and have been out for at least a few months. I was trying to keep pace with them. I could have cut out half way through if it wasn't for the "peer pressure" of my workout buddies;-) I asked them to slow down a few times on the trails as I was sucking some serious wind.. they did without a problem.
I'm glad I stuck around though. It seems I faired pretty well on my first ride. I'd like to hit the trails a little heavier next time. Half our ride was on the road path it seems. The heat on the black asphault killed me.