Introduce the notion of CHQP (Assessor firm internal QA) start and end times
There are times when the addition of assessor team quality review pushes past the 90-day window. We get backlogged the same way you do. We always adhere to the 90-day window for accepting and reviewing evidence, and we can demonstrate that reasonably. But it would be helpful if there was some flexibility around the submission date. If we plug in the real dates of assessment, and then submit 91 days after we started testing, the system errors due to >90.
Introducing the notion of the defined assessment window of 90 days, and the CHQP review period (stated dates) might help to explain the assessment and offer the assessor firm a few additional days when needed to complete a quality review.