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in half wave rectifier circuit ideally diode conducts 50% of time but practically it is less than 50% of time.
for conduction time, consider the duration in which diode ON or conducts.
If you want to estimate the percentage of time without simulation then draw your sine wave and mark the points on the half wave where the diode volts drop is exceeded.
I fear, the question is meaningless (and phrased vague, anyway) without giving additional parameters. A half-wave rectifier may e.g. have a capacitor or battery load ... In so far, the laconic answer from Protyp_V1.0 seems appropriate.
If the load as seen by the diodes is inductive or resistive then the diodes conduct for the complete half cycle. If the load has part capacitive load then the angle of conduction depends on the amount of ripple on the output. The lower the ripple the smaller the angle of conduction. Draw out your waveform, put a line across at peak voltage and another at peak volts- ripple volts. Look at the area of your waveform between theses lines, this is the conduction angle. Remember, peak volts = transformer volts - volt drop across diode.
Frank
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