After I returned from Canada, I received this e-mail:

"Since your [NEXUS] application was conditionally approved, as of August 3 our system does not register the scheduling of an interview to finalize your enrollment. To prevent your application from being denied, please schedule an interview immediately."

I'm not sure when I'm returning to Canada.

Therefore, how many days can I delay getting in touch with an enrollment center to schedule my FIRST appointment for an interview? Yeah, I already know that I can reschedule this first appointment.