You know you have to share content consistently to help people know, like & trust your business. So creating content for your blog is always going to be a part of your marketing. Staying ahead of yourself is the best way to avoid pressuring yourself to put out mediocre content at the last minute.
You want your content to be the best it can be, as it represents your knowledge, expertise & business. The best way to do this is to research, plan and draft your blog posts. As you know your time is valuable.