It depends on the topic. With health-related stuff, I've been working in this industry for more than 20 years so a lot of it is just ingrained in me from sharing it so much.

Some articles (that aren't even too long) can take me 5-6 hours if it's new information in a different topic.

I wouldn't worry on what others are doing and take as long as you need on your articles. It shows you are investing the time into making them as good as possible.