Can someone tell me...
if I just want to buy as a walk in from the store - in the past how many days did it take from launch day till one could just go to the store and walk up and buy one - in other words - if it sold out first day from the lineup - how long did it take to get stock back in?
It always was different from store to store, even in the same country. People think "everyone is queueing, I better join the queue", or they think "nobody is queueing, no need to come early". They think "Store X will be sold out", therefore nobody tries buying at Store X, so Store X has plenty of phones.
Stock will come in very soon, but it will sell out very soon as well. And people's willingness to wait is different, so first day you get weirdos who camp out overnight, first week you get customers willing to get up early to be first at the store, after four weeks you get the ones who absolutely hate going to a store and not getting exactly what they want. I'll only buy a phone if it's in the store in all the colours and all the sizes that are available and I can buy whatever I want and as many as I want.