Nintex Flexi Task Escalation Feature

We're using Nintex 2013, and I have a flexi task set up so that reminders are sent every 10 business days, 3 reminders total. On the escalation screen, it says "Time to Escalation" and then has the days/hours/minutes fields. Is the time calculated from the end of the reminders, or from the original task assigned date? The documentation says, "Escalation occurs after all reminders have been sent and the specified "Time to escalation" has elapsed." That's a little ambiguous to me.

Thanks!