Time required to hide posts and to manually edit posts (that are not abusive but quote an abusive post)? Let's call it 5 Minutes. Time required to hide a thread? 5 seconds.
We work hard to keep this place tolerant and some people ignore that effort, or see it as a challenge. I've hidden 2 posts from this thread already this morning, one since I posted the polite request above. We do our best to go post-by-post, and we try not to remove threads (especially ones showing such important things). But, fundamentally, when I come to a thread of 40 posts, of which about 75% are abusive in some way shape or form, I'm not going to do that much work.