I have seen "response time" on few "top rated sellers" as well as "Level 2 sellers" having 50+ orders in queue to be 3-7 hours. That means that they're not online 24/7 and yet their business is booming. So it says that, it's more about the attention to detail while replying to queries rather than how speedily you do attend them. 🙂 The same thing is explained in this course offered for free by Fiverr Online Freelancing Essentials: Be A Successful Fiverr Seller