Just to clarify, with this sample scenario:
- Page 1 - Start of Visit (10:00am)
- Page 2 (10:02am)
- User Leaves Site for 1 Hour (10:05am)
- Page 3 - Start of Visit 2 (11:05am)
- Page 4 (11:06am)
Are you trying to get the time spent (including the hour they left) from 10:00am to 11:06am - resulting in 1 hour 6 mins.... or just the hour they were gone (Page 2 to Page 3 between sessions) 10:02am (when they actually left at 10:05am has no timestamp) to 11:06am resulting in 1 hour 4 mins?
Either way, I am not sure that Adobe can natively support that...
Adobe's time spent is a calculation of timestamps on page views, and the sessions expire after 30 minutes of inactivity, so I don't know how you would be able to track either the full Visit 1 to Visit 2... or the actual time spent away from the site...
You might need to do a custom solution using Raw Data and timestamps to do a custom calculation....