Hi there, chris99.
For now, there isn't a report in QuickBooks Online to help us determine how long your customers normally take to pay their invoices.
Exporting the Invoices and Received Payments report is one of the workarounds available that you can use at this moment. I'll take this as a feature request and pass it on to our engineers. Customer suggestions and feedback will be collected and reviewed for future updates.
You might also want to visit our App Center and check if there's a customer-management app that can generate this type of report. Here's the link: https://appcenter.intuit.com/app/apps/home?categoryId=Manage-Customers&isViewAll=true.
The Community is always here if you have other questions.
