Since October 2003, SpamCop has been tracking user's speed at reporting spam. This speed is calculated by comparing the time that the spam is received at the recipient mailserver with the time at which it is submitted as spam to SpamCop.
Turn-around time is very important for SpamCop. Quick notification lets responsible administrators take action before the damage is too great. It also makes sure irresponsible sites get blacklisted - also, before the damage is too great.
[Append to This Answer]