At least I would assume they would try to create a set of test locations that they would first update instead of everything. I understand that there may be diff

At least I would assume they would try to create a set of test locations that they would first update instead of everything. I understand that there may be differences in hardware but I still find it odd they wouldn't have a more limited deployment. Even with all the testing you could ever do pushing an update to everything at once without any real world testing seems absurd. Also I think it is hard to ask when you should push the update but based on their hours it seems like you should not push an update on Saturday of all things. If you are not going to do limited testing first then I think you should deploy 8-9 on a weekday, I would guess Tuesday would be the day with least traffic so do that. Under no circumstances should you push regular updates on a Saturday, especially since that requires work Sunday if anything goes wrong and impacts what are probably 2 of the top 3 days of the week for this kind of shopping.