Creative types seem to push themselves to do more, more, more.
I know. I've done that. Unfortunately, the results of my efforts were not up to my usual standards.
So, if your novel writing takes a bit longer than other authors', then that's just the way it is. Be more concerned with outcome over process.
I recently ran across an article that I found quite encouraging, The Daily Word Counts of 39 Famous Authors.
Turns out I'm pretty normal. I write more than some famous authors and less than others.
Personally, I've been a lot happier when I don't push myself to create goals that my writer friends have for themselves. I've stepped off that treadmill of comparing myself to others, and I'm a better person for it.
Still, it's important to set a schedule. You need to find time to churn out words. One of my tricks when I seem to be slowing down is to set a timer for 15 minutes with the goal of writing 500 words. I've always met that goal.
I've come to a time in my life when I'm more deliberate and thoughtful of my efforts. Setting realistic goals is just one area that I work on.
Keep moving forward, friends. Slow and steady still finishes the race.