I have over six months of experience writing email newsletters for an online crystal company. I can provide samples of that work if necessary. I did the research for the newsletters as well as consulted with my client to make sure that we were both on the same page about everything.
I will keep constant contact, and my turnaround rate will vary on the depth of research required and the word amount specified, but it will typically be done within 48 hours but no more than 72.