I understand the page but when I change my handling time the EDD doesnt change, so at least to me (and many other sellers) it seems like handling time plays no part in it. You cant use the seller supplied data of handling time and the historic data and come up with a working EDD.

Its a constant complaint that we (eBay sellers) have eBay claim that handling time set for the seller makes a difference but if we change it there is zero difference so I'm sorry but it clearly makes no difference. If I change it to 5 days it should add 5 days on, otherwise its designed not to work correctly or the handling time has no part to play in EDD, It can not be both, its impossible to be both.