I got it!  Maybe because I logged into analytics and went right to components to create the new segment...?But I went to a report and then created the segment and it seems to work!  Thank you for your help.

Dear Gigazelle,Love the logic, however, I can't even save this as a segment.  My 90 day sample box also yields 0.  I tried adding it into containers, taking it out of containers, etc. but no luck.  Any thoughts as to why?  Thanks!

That just gives intervals between sessions and it's at the visit level.  I want to see by day; if you used the app one day in January, 2 days in February, and then another day in August.  I don't care how many times within that day you've launched or used the app.  Just trying to get overall usage o...