Adding my agreement that QBO needs to have the "Average Days to Pay Report".
QBO users end up paying well more over time in subscription fees than Desktop/Enterprise users, we should have access to the same features and reports. I only use QBO because my team is remote, so access to QBO is easier and more reliable than remotely hosting Desktop/Enterprise.
I would be happy to export a report into Excel and do some magic to figure the payment averages out myself, but honestly, there is not really any workaround listed that will solve the issue for me other than spending hours manually calculating it via the "Invoices and Received Payments" report. Even if the payment date could be added onto the "Invoice List" report, that would be a huge help.
What I am going to use is the "Invoice List" with the "Last Modified" date column added, and make a wild and inaccurate assumption that the invoice is last modified when the payment is posted. That is only true if you always post the payment on the day it is received and never touch the invoice after that for any reason, but it is the closest thing that I have without a lot of extra manual work.
Please add the report for us soon. It should be a top priority for new features.
Cheers!
