Extend the 1000 record limit on order report

We currently bill weekly from the order report (Dashboard>Despatched>Report) and have noticed when checking previous weeks that new jobs are appearing in weeks already closed off. If i could export the report for more than 1000records i.e by month and or year, it would be quick and easy to ensure no orders are every missed in previous billing weeks. Also, as our customers are increasing, what should be a very quick copy and paste process is becoming time consuming because we are loading 1 report for each customer, for approximately 5 days at a time. So this function is becoming more difficult as we scale up