Thanks! It's outsourced. I actually use another YC company, Mobileworks, to source the editors.

As for time limit I just charge for 15 minutes or 45 minutes. You get what you get in that bucket. Some folks can get a bunch of help depending on the length and density of their writing. It all really depends on the situation. Some stuff that comes in for 15 minutes is like 4000 words of deep philosophical treatise, hard to proof read much of that in 15 min, but we do our best! :)