You can push the time to longer if you are first in and last out. And you can do four or five days if you want, but you won't be around for the resort activites. Up to you really
Here are the profiles I did:
Shore 7.2m 82min av depth 4m
Boat 16.8m 60min av depth 7.5m
Boat 18m 58min av depth 8.7m
Shore 7.1m 81min av depth 3.3m
Boat 18.1m 59min av depth 10.1m
Boat 17.6m 61min av depth 9.6m
Boat 27.7m 48min av depth 12.2m
Boat 18.4m 63min av depth 8.2m
Boat 17m 62min av depth 7.2m
Boat 25m 45min av depth 14.2m
Boat 18.5m 50min av depth 12.5m
Shore 7.4m 102min av depth 3.5m
Boat 16.2m 61min av depth 8.6m
Boat 20.7m 59min av depth 8.9m
Boat 17.2m 63min av depth 9.8m
Boat 17.m 73min av depth 7.2m
As I said, we missed out on doing more shore dives due to unseasonable rain as well as a wedding. I don't think even with more shore dives I would have come close to NDL though. You can do a much deeper average depth than we did, but I personally didn't see the point as it reduces dive time, and there is heaps of colour and life on the top of the bommies, which I found a lot better for photos.