For what it's worth, I did the 5k and 10k during marathon weekend back in 2020. I was dealing with an injury and was only able to run the first half of the 10k. I walked the rest. My husband and I were in the corral ahead of my sister and her friend. They ran the whole thing and never caught up to us. Unless you start in the last corral, I bet if you can do 4 miles, you will not struggle to finish the 10k. But, if you are concerned and want someone to encourage you along the route, let me know. I was supposed to do it with my sister who decided to fall down some stairs and break her foot last week. So now, the plan is for me to go at it alone.