Oracle Service cloud session time out after 30 mins

Summary

When a customer is updating the incident and before clicking update button, he doesn't do anything for next 30 mins . After 30 mins he clicks on update then message is shown "we're sorry, but that ac"

Content

When a customer is updating the incident and before clicking update button, he doesn't do anything for next 30 mins . After 30 mins he clicks on update then message is shown "we're sorry, but that action cannot be completed at this time. Please refresh your page and try again" . I tried different configuration but it doesn't work.

Is it session time out after 30 mins and is there any way I can increase session timeout length.