4 days thing in .com is being criticized by all , as in US shipments from West coast to east coast and vice versa are normally delivered in 6-7 Days.
For .in , 10 days is the maximum time in which couriers should be delivered. Racing for time: reason is simple, ebay wants sellers to always keep tracking the consignments to avoid any delays.
one way It's good also, think from this point of view, Had we not had facility of ER we would be putting our heart and soul to move the shipments faster so as to get buyer confirm item receipt ASAP. with ER we tend to forget the fate of shipments once they are booked. A little tracking wont really hurt.
I have a software in Excel prepared which keeps me updated about all the shipments sent. And alerts me for any delay.
Will upload the link in a couple of days if more sellers ask for.