Curious where you got the 40 month "residency". The Not sure exactly what a DNAP is but the DNP (Doctorate of Nursing Practice) calls for 1000 hours above the current APN (advanced practice nurse training). Most CRNA programs seem to be around 27 months. The ones that are transitioning to DNP seem to be around 36 months which would confirm this. Remember this is combined clinical and didactic time not just "residency" by which I presume you mean clinical time.
Here is the ANA position:
http://www.aana.com/uploadedFiles/P...DNP/Addendum B - Presentation Highlights .pdf
Here is the white paper which mentions the practice title:
http://www.aacn.nche.edu/DNP/pdf/DNP.pdf
Here is the NONPF statement:
http://www.nonpf.org/NONPF2005/PracticeDoctorateResourceCenter/CompetencyDraftFInalApril2006.pdf
Just in case you doubt the true intention of the DNP here is one statement:
"Competency Area: Independent Practice
(1) Practices independently by assessing, diagnosing, treating, and managing undifferentiated patients
(2) Assumes full accountability for actions as a licensed independent practitioner"
David Carpenter, PA-C