I always got the statement from Workfront, that the hours are all in the beginning and are only distributed when the resource planner loads. Consequently, we couldn't find a way to have the information used in a report.
The resource planner is probably helpful in some environments, especially when the employees are managed on a day-to-day basis. As we plan in 'days per month' over a timeframe of '>6 month', the resource planner doesn't fit the needs and unfortunately it cannot be adjusted. Consequently, we need to access the information with a report.