All of the timelines in our publishing process are estimations, and since all manuscripts vary greatly, so too can the turnaround. Our editors always do their best to work within the required timeframe (generally two to three weeks per round of editing), and across the company we aim to be as expedient and efficient as possible. That said, we also value quality above all else, and editing is certainly a service that can be compromised when not given the time it requires; it is by nature careful, cautious, and measured. Due to the depth, breadth and/or complexity of a manuscript, editing services may be completed before the deadline or, in some cases, shortly after. Your project manager will let you know if there are any changes to your expected timeline.
The rest of the timing for editing hinges upon the time you take with your revisions. This refers to the time between editing rounds, or between editing and interior layout, during which you review the editor's suggestions and make any necessary revisions to the manuscript before resubmitting.