On the Edit Campaign screen for any Session campaign the length of the cookie time for the Session campaign will be listed which by default and most campaigns across the Mongoose Metrics service is 720 minutes or 12 hours.
This cannot be changed in the dashboard but a Mongoose Metrics support representative can alter the setting; however, it is highly unrecommended since the number pool size given for this campaign is based on a 12 hour cookie. Also our phone call keyword correlation is based on there being a 12 hour cookie as well.
The Rest Period then shows how long the number is "rested" within this Session campaign's number pool before becoming available for the next visitor which by default is 30 minutes. This is also not editable from the dashboard but Mongoose Metrics can change it in the back-end.