Obviously this is experience talk; however there are some experienced users who are willing to share their experience rather than selling their expertise are available when time suits them well.
Given crewing is rather unique and is a matter of local knowledge, this is always useful to share with other similar users to work your way out to suit your business needs. That's why AGIFORS keeps running the working group meeting almost once every year. It was another useful forum to learn from others painful exerience.
Hope this helps.
Cheers
