Issue History Collector
Issue History Collector is a Service Desk app that provides an ability to show issue duration by assignees and/or statuses.
Monitor issue duration in real time
View total time in the specified statuses
Calculated custom field shows how long an issue has been in a particular status. There is an option to highlight the time if it exceeds specified threshold.
Reports by issues history statistics
Project reports enable you to keep track on status duration by user or time spent by user to complete a business process.