Add note about invoicing delay

Author: muhsinking

accounts-billing/cost-centers.mdx

@@ -93,14 +93,18 @@ Deleting a cost center moves all its assigned resources to the uncategorized lis
 
 ## View cost center spend on invoices
 
-Your Runpod invoices include a breakdown of total spend by cost center. Invoices are generated monthly and show how charges are distributed across your organization's cost centers for that period.
+<Note>
+Invoices may take up to 60 minutes to reflect new spending data.
+</Note>
+
+Your Runpod invoices include a breakdown of total spend by cost center. Invoices show how charges are distributed across your organization's cost centers.
 
 To view invoices with cost center data:
 
 1. Navigate to the [Cost center page](https://www.console.runpod.io/user/cost-center/tags).
 2. Select the **Invoices** tab.
 
-Each invoice shows the total amount spent per cost center during that month, making it easy to allocate charges to the appropriate teams or budgets in your financial systems.
+Each invoice shows the total amount spent per cost center in a given month, making it easy to allocate charges to the appropriate teams or budgets in your financial systems.
 
 <Note>
 Invoices reflect the cost center assigned to each resource at the end of the billing month. If you change a resource's cost center after the month ends, the change applies to future invoices only—previous invoices are not updated.