When and How many hours before the chart is prepared and when the chart is prepared for morning trains.

For the trains starting between 12 pm(After Noon) to 12 am(Mid Night),chart preparation is done 4 to 6 hours before departure of train. 

For the trains starting between 12 am(Mid-Night) to 12 pm(After Noon),charts are prepared on the previous night around 8 to 9 pm.