Rate Limit for List incidents API

Hello Team
I am trying to get the List of incidents over a period of time (2 Days) of the entire organization. the documentation mentions there is a rate limit of 900 events/min across the organization. https://developer.pagerduty.com/docs/ZG9jOjExMDI5NTUz-rate-limiting.
is it 900 API calls per min for entire organization ??
what is the allowed rate limit per API Key for an account ??

https://developer.pagerduty.com/docs/ZG9jOjExMDI5NTUz-rate-limiting says entire organization.