I quote every project individually as a fixed fee based on the specific scope of work. I do the same with timelines. Every project is different and the turnaround time depends on your required time window as well as my current workload and backlog.
Hiring a new copywriter (or hiring anyone for that matter!) can be stressful. You want to make sure you're not wasting time and money on someone who won't deliver. So, this is my contract with you: