Why would you want to be disturbed every few seconds? It's bad enough with interruptions from emails, chats, skype, calls, messages, coworkers walking in etc. This might actually have the potential to kill your remaining few productive spells.
Apart from that. Personally I keep a tab with real time because I like to look if there is a surge of users(I mostly have max 5 concurrent users) because it might mean someone mentioned the site somewhere so I like to go and maybe try to participate in the conversation.