It depends on the volume of the project and its requirements. You can discuss this with the client. A client may ask for content to be expedited, but you can turn down expedited projects from the beginning if you cannot complete them on the client’s prefered date.
Don’t forget that you must send the written content to the quality assurance team 24hrs before the deadline, for them to check its accuracy and run it on Copyscape to confirm the uniqueness of what you’ve written before sending it to the client.