Lascaris War Rooms--Valletta, Malta--Possible Heritage Pass

About how long would it take to tour the Lascaris War Rooms? We are a family of four--2 adults and 2 elementary-aged children. We are debating whether or not to purchase the Family Heritage Pass. However, we are only in port from 8-6. The Heritage Pass would also include the Saluting Battery, Fort Rinella, and Malta at War Museum. Thank you in advance for any insight!

I think that we were about an hour, perhaps 90 minutes. It was very interesting and we were glad that we went. Were in Malta for one day on a cruise and then returned for a ten day stay. We did the war rooms on our return visit.