We are using Channel Form to allow guests to submit contest entries into an EE 2.8.1 site. The form has many fields including an essay field which means it could take some time for someone to complete the form and submit it. During my own tests, I received the EE expired form error message several times when the form had only been open for a few minutes.
How can I go about extending the life of an XID hash to a longer block of time?