A single report to show Invoice Date, Invoice Number, Date Due and Date Paid

This is a basic requirement for managment accounts.  How long are customers taking to pay? As far as I have researched, there is no way to do this except by running separate reports, exporting to Excel and spending considerable time compiling the required report.  All the fields required to build the report are there - no additional calculations required.  I have seen requests for this report going back years, and I can't understand why it can't be produced.  If there is a way and I haven't discovered it, please let me know.