Delivery time, date for gas cylinder booked not indicated

One of the major problems faced by those having a gas cylinder is that the delivery time and date for the cylinder is not clearly specified.
So the person who has ordered a cylinder has to keep waiting for the cylinder to be delivered
This is very inconvenient for those who have a job , as they have to take leave, if they do not have anyone at home, to take delivery of the cylinder
For most jobs, the number of leaves a person can take in a year are limited
The gas website is only indicating the date till which the cylinder bookings are cleared, not the date of delivery.