With justifiable reduction for no design (upwards to 30% max duration reduction) valid durations could go down to 1.5 days annual surveillance and 3.5 days for recertification, without any reductions applied you're looking at about 2.5 days annual and 4.5 days for recertification...........Your numbers are between there, correct? None of this is secret mumbo-jumbo, just basic application of IAF MD5.