How to write blog posts faster

One of my friends works in SEO and also writes content. But writing blogs takes a lot of time, like a whole day for a 1500-word blog. Can anyone suggest how to write a blog quickly without copying from others?

Does your friend has real experience in writing blog posts?
I am not asking this question to intimidate you but as a concerned fellow because for an experienced writer, a 1500-word blog will only take hours to complete.
Seemingly writing one blog per day shows that your friend is just an amateur in the industry therefore he/she should write for sometime in order to gain experience to write faster.