Time Spent per Visit as Metric in DW (not just as breakdown)

[#1]

Currently Time Spent on Page and Time Spent per Visit are currently only available as Breakdowns in Data Warehouse.

I would love to see those two added as metrics, e.g. Time Spent per Visit by Visitor ID

[#2]

Brett announced "time spent" as a new metric for all Discover reports at the Summit. So maybe you'll get your metric soon

[#3]

Time spent is available as a metric in data warehouse. Time spent on page and per visit can be calculated from there.