In reply to DaveHK:
Depends on the group and how confident you are with them.
Idealy I see them a few times during the day on the route and then at the campsite at night. After that leave them too it.
I dont camp on the same site as them if i can help it, doesnt give them the impression of independence if you are on top of them all the time.
If they cant cope in the area that they are in by themselves then they shouldnt be there- words from the d of e handbook.