It's not uncommon to see some people who have never done anything before in their lives and they're always late. I don't know why they are always late to reply, but it's a very common thing. It's actually sad that some people are so late to reply. It means that they don't care about the other person and their feelings. Go to moses promised land for best ideas. They don't even want to read what you've written or hear your voice because they just want to get out of there as soon as possible, even if it's because they have work to do or something else important.