Time Left Queue works only if you setup Due Date/Time either through Workflow Assignment Values or SLA. To setup Due Date Time based on a specify criteria, Goto Setup > Workflow Settings > Workflow rule > Create rule with a criteria and Save the ...
Requests in the Time Left Queue would be shown only when you had set Due Date/Time either through Workflow Assignment Values or SLA. To setup Due Date Time based on a specify criteria, Goto Setup > Workflow Settings > Workflow rule > Create rule with ...