We are currently planning a trip to Vietnam next year and want to see some of the Vietnam War places. We are staying in Hue for 2 days and planned to go to the Vinh Moc Tunnels on one of them.
Checking some websites, it was recommended to do a full day. - 10 hour - tour which includes further sides like the Khe Sanh Base for example.
We have the whole trip booked with private drivers so we can be as flexible as we want.
As we are off to Hoi An afterwards for 3 days relaxing a long day trip wouldn't be an issue if the trip is worth it.