The ECG criteria for accelerated idioventricular are: wide complex rhythm with no P waves associated, rate between 40 and 100 bpm.
On various websites there are a variety of rates listed for AIVR
Life in the Fast Lane: Rate 50-110 bpm.
ECG-pedia: 60-120 bpm
Emedicine Medscape 40 to 100 to 120 bpm
EKG Academy: bpm.
ECGguru: 40 and 100 bpm