This question originally came up in our Slack community and the thread has been consolidated here for long-term reference.
How frequently is the billing section updated to show usage of minutes? Is it real-time?
The dashboard is not real-time and its cache is variable based on the analytics backend processing loads.
The usage will be correct when your invoice is created:
For real-time usage tracking, you can subscribe to webhooks and track those, or send the data you need from your agents.