A single - phase, full bridge, fully controlled thyristor rectifier feeds a load comprising a 10  resistance in series with a very large inductance. The rectifier is fed from an ideal 230 V, 50 Hz sinusoidal source through cables which have negligible internal resistance and a total inductance of 2.28 mH. If the thyristors are triggered at an angle α=45 , the commutation overlap angle in degree (rounded off to 2 decimal places) is _________.