Most of passenger using VB will not be using local bus anyway . Calcutta is geographically not very big city like NCR where you may have to pay 1000+ from NDLS to Gurgaon. Most of ola /uber even at late nigh you can get within 500 in calcutta city. Also yellow taxis are available and also prepaid counter are open at night also in howrah station. So reaching by 11 PM is not a issue at all.