Which of the following services is typically billed hourly in data centers?

Remote hands services are typically billed hourly in data centers because they involve on-site technical assistance for tasks that require a physical presence. These services can include equipment installation, troubleshooting, maintenance, and configuration tasks that the data center staff perform for clients who may not be able to be physically present or who prefer to outsource the labor.

Clients are usually charged based on the amount of time technicians spend on these activities, which is why it is common for such services to be billed hourly. This hourly billing structure provides flexibility to clients, allowing them to pay only for the time actually spent on their specific requests.

In contrast, other services listed typically have fixed pricing structures. Power overages are usually charged at a predetermined rate once a certain limit is surpassed, cross-connect fees are charged as a flat fee for connecting different networks or services, and cooling services tend to be part of the overall costs included in the data center's service agreements rather than billed on an hourly basis.