Record time to first intrusion?

In people's experience here, what is the shortest time to record an intrusion attack on a virgin server that simply has an IP address and no domain name pointing to it?

The IP address had not been used before, and, if it makes any difference at all, the server is a new machine in a new rack.

The server is running Debian Sarge and, at the time, had precisley no software on it except the intrusion log. It happened before we had even had time to install the firewall

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Pretty obviously the entire server security is now bolted down. I'm not going to be stupid enogh to say it is intrusion proof. But more than basic skill is needed to get in.

As a side issue I'm very happy to receive advanced hints and tips on making it even more bank vault like Record time to first intrusion?

 

 

 

 

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