What’s the difference between a blog post written in 15 minutes versus 1 hour? I’d argue that both methods would end up giving the same result (remember our college procrastination days?). A 15 minute piece of writing has the potential to end up being just as effective as a 1 hour piece of writing.
Just because we give ourselves more time doesn’t always mean that quality or impact goes up.
Get to the point. Just write.