Factoring your monthly quota amount, you can create as many requests as you like with as many different words counts you feel like using. The length of the copy determines how many briefs you can have and the turnaround time to complete.
Depending on the plan you subscribe to, you'll be able to distribute out your total word quota for a given month across as many requests as you'd like with as many different words counts you feel like using. That way, the content you need can be completed all at once instead of on a weekly basis of one job at a time.
An average 1000-word content with research takes five business days to complete.