One of the most common weapons in the cybercriminal’s arsenal is the DDoS attack.

According to the network security experts at Digital Attack Map, “A Distributed Denial of Service (DDoS) attack is an attempt to make an online service unavailable by overwhelming it with traffic from multiple sources. They target a wide variety of important resources, from banks to news websites, and present a major challenge to making sure people can publish and access important information.

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While many have heard of these attacks or suffered from the outages they cause, most people do not understand the true business risks these incidents pose. To get a better picture of the threat, Internet security firm Incapsula surveyed 270 firms across the U.S. and Canada about their experiences with DDoS attacks. On average, they found, 49% of DDoS attacks last between 6 and 24 hours.

“This means that, with an estimated cost of $40,000 per hour, the average DDoS cost can be assessed at about $500,000—with some running significantly higher,” the company reported. “Costs are not limited to the IT group; they also have a large impact on units such as security and risk management, customer service, and sales.”

Check out the infographic below for more of Incapsula’s findings on the actual costs of DDoS attacks: