Workflow reports

In the workflow reports, do the transition delays include weekends or are the based on M-F workdays? I noticed that these transition delays seem a bit longer than expected. 

Are there other ways I can view workflow statuses in a report? I'd like to see the time it took for each status to move to the next stage. It will help me gain a better understanding of how long approvals take and help me identify who's are taking too long.