Concurrent Calls report works for 1 day but not for a month

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Select only Concurrent Calls
2. Select 1 month or more for Call dates
3. Run the report and it takes for ever and won't come back with report.

What is the expected output? What do you see instead?
It should show concurrent calls for whole month with MAX Calls showing

What version of the product are you using? On what operating system?
Latest 0.9x

Please provide any additional information below.

Original issue reported on code.google.com by bruce....@sharpcall.ca on 21 Jun 2012 at 8:17