AV nodal delay is:
Velocity of impulses at different parts of conductive system:

Atrial muscle fibers : 0.3 meter/second
Internodal fibers : 1.0 meter/second
AV node : 0.05 meter/second
Bundle of His : 0.12 meter/second
Purkinje fibers : 4.0 meter/second
Ventricular muscle fibers : 0.5 meter/second

Thus, the velocity of impulses is maximum in Purkinje fibers and minimum at AV node.
0.2 sec
0.13 sec
0.01 sec
0.3 sec