If you are going to model work resources, they will always work out the cost per timer period (minute/hour/day/week etc). If you are saying, a resource who works 2 hours on a task gets paid for 12 hours, then you cannot use work resources. Instead you could model this using either material resources (a material being a person) with a resource label of per person” and an associated cost “per person”. If you have different labour rates for different roles, the this will need to be reflected by having different resources representing the roles in the resource sheet. Material resources do not effect the work, so this would have to be entered manually.
I’m assuming you’ve set up 24 hour calendars, and set the hours per day etc to be 24…., default start time to 00:00 etc….