While I agree with spanning it over six+ hours, you might be surprised at the activity level in shopping centers at midnight. Once upon a time, I worked nightshift at walmart stocking shelves- on my days off, I'd still have to be awake all night to maintain a sleep schedule. To retain my sanity, I'd shop at other grocery stores so it didn't feel like I lived at walmart, and I was pretty surprised by how many shoppers were out and about at 1 and 2 am at stores like Ridley's or Smith's.