Less than 1 month –
Less than 10 hrs/week –
We need an expert to help us to rewrite case studies. Right now they are too brief - http://marsspiders.com/work/
I expect that you need to be a technical copywriter with creative flair to emotionally engage our audience.
You will also need to independently research the keyword planner and apply 10% keywords for every 100 words.
Ideally you are conversant with SEO.