No, it doesn't matter! If you are happy to have 'meal 5' for breakfast and then 'meal 2' and 'meal 4' for lunch, that's what you should do. If you want to eat all the meals of a certain day at 1:00 PM - within an hour and a half - you should do that, and if you want to combine three meals into one large meal, that's fine too. Just do what feels good for you; there is no right or wrong.