Basing Queen Elizabeth on Tiger requires the battlecruiser's design to progress further before the battleship design begins. The delay is explicitly a rough estimate. Ten weeks is considered possible if Tiger develops as it did historically. The scenario adopts about three months, approximately thirteen weeks, as a more generous allowance. Later commissioning and strategic consequences depend on that assumption.
Chapter · 28:38-29:46
A rough three-month delay for the Tiger-based design
Using Tiger as the basis requires waiting longer for its design, with roughly thirteen weeks adopted for the scenario.