This is dependent on the turnaround time you have selected.
For documents less than 10,000 words, the turnaround time you select when checking out is the latest your edited manuscript will be returned. The actual turnaround time is often far less.
For documents over 10,000 words (such as a thesis), the turnaround time depends on the word count. These documents are attended to by a dedicated editor at the highest possible urgency and take around 2-3 days for each 10,000 words in the manuscript. A 30,000 word thesis would therefore take between 6 and 9 days to return.
We have a number of in-house rules and contingencies to ensure that these deadlines are always met. We also monitor the progress of all orders so should an extremely rare case arise in which we suspect we are going to fail to deliver on time, we will contact you to explain and offer compensation.