To begin, let's start with a question. If your buyers are searching the web for solutions to their problems, what content is influencing them?
Is your blog weighing you down? It shouldn't. Just how long does my blog need to be?
Let's cut right to the chase. TIP: when blogging, it's about quality NOT quantity. Don't think about it in terms of how many words. What matters, is the content within the blog. Are your readers intrigued? This food service blog post example from Eaton Marketing makes good use of keywords, pictures and has a Call-To-Action at the bottom giving the reading an opportunity to request more information.