Hi David,
You can make your own segments in Adobe analytics or Ad Hoc analytics with the dimension “Time Spent per Visit – granular” and use them as metrics. In Adobe analytics this would not be very useful because you would have to make a report for every segment (you could put them all-in one dashboard though). But if you have access to Datawarehouse or Ad Hoc Analytics you can put all the segments as metrics in one report.
Don’t forget to exclude the visits with 0 seconds; these are the single page / single server call visits with no time registered.
If you have any questions, let me know.
Cheers,
Martijn