It depends on many factors such as the complexity of the pages, how detailed your briefing will be, your availability to give feedback on the delivered designs, etc.
Let's get a landing page, for instance: if you provide your designer with a very detailed brief, a wireframe (it could even be a pen/paper sketch), and the style guide, you'll get the first draft back in the next working day, according to your subscription plan. Depending on the complexity or the size of it (e.g.: a very long one-pager), our team will send you a draft so you can provide feedback on what you like/dislike, and the next day, they'll deliver it completed with your feedback revised.
For most projects, you can expect the initial mock-up in around 1 business day (depending on your plan).