One week without a laptop

I’ve sent in my MBP for servicing because of a grey spot that looks like a smudge inside the LCD. It’s not that noticable before because I’ve always kept my dock on the left side of the screen to maximize the vertical space available for my apps. Lately however, I’ve been using an external monitor so I had the luxury of putting the dock at the bottom. When I disconnected it from the external monitor so I can use it on my lap, that’s the time I saw the smudge. I wonder how it got there though. The lady at the service center told me it’ll take around 5 working days before I get it back. I hope I get it soon though. I’ve heard of stories that it can take a month or two for LCD screens to be replaced.