Who informed you so? There are 2 buses plying between Godda and Kolkata. Both of them depart between 6 - 6:30 pm and reach Kolkata between 3:30 - 5:30 am depending upon the road traffic.
In return, both of the buses depart Kolkata between 7 - 7:30 pm and reach Godda between 5 - 6 am.