As long as you want them!
The longer the content you require, the more time it takes to write. There is a minimum requirement of 300 words that has a 5 day turnaround time and 4,000 words takes roughly 20 business days to turn around. You can ask for 300 words up to your monthly word count in on brief or broken down to as many as you like.
Do keep in mind if you exceed your monthly word quota you will be billed overage rates for those briefs that are submitted after going over the monthly amount.
If you're looking for multiple pieces to be completed, our recommendation is to submit requests separately so they can be done in parallel by our writers and delivered back to you quicker.