yup - that is fine - either 2 groups, say 5 minutes apart, or what we sometimes do is get each group to do the same lanes but in opposite order, that way you are checking all the lanes, and meet up in the middle at a pub . that way any lane probs, you can swap info . you will need both groups to be able to contact each other (diiff cb channel) in case there are any holdups or probs.