rames14 has it right referencing the rules of 3 if doing long term travel. For a week, you'll do fine. But, after a week you'll be tired and worn out.
If traveling to a destination where you will stay for a while (3 days to 1 year type of stay), then driving long days and short overnight stops works OK. But, my wife and I have found that 3 days of hard travel is about all we can handle. Even when we were younger, 3 days was about it.
One thing you do not want to do (and this took us a few years to figure out), you don't want to push so hard with the physical intensity and mind awareness that driving a hundred thousand dollars of truck and trailer brings, that you arrive at your destination so physically and mentally exhausted that you cannot enjoy the destination.
We did this multiple times, especially when the kids were little. We pushed so hard to reach the destination, that when we finally got there, I was so exhausted from the long drive, I could not enjoy the first couple days. They kids wanted to "go, go, go!" My wife and I were so "pooped" we just wanted to vegetate and recover. And actually, the activities we engaged in with the kids .... today in memory ... is just a blur! Our minds were so exhausted, we couldn't absorb the moment we drove so far to see and do.
When the kids no longer traveled with is, we slowed down. We found longer trips, like distances of a thousand or two thousand miles or longer worked a LOT better if we traveled day 1 and stopped. Day 2 stayed at that destination. Day 3 travel to the next stop over and stay put. Day 4 enjoy that rest day, and day 5 travel again ... and keep repeating. Of course, this works well if you have the time.
Another thing ... in all your best laid plans... on an average, you will actually travel only 50 miles an hour. If you plan on 400 miles a day, you should plan your actual time between campsites to take at least 8 hours. Your driving speed may be 65 mph, but in reality, it will all average 50 mph because of breaks, fuel stops, food stops, and ..... don't forget ... along the journey you may want to stop and see something you didn't expect.
I remember clear one time traveling, my wife was snoozing and I kept seeing this sign, mile after mile for a restaurant that served "foot high pie". She was still snoozing when I pulled into that little restaurant. She was surprised I stopped and when she found out why, she was delighted.
Well, the pie was not a "foot high", but it WAS a good 8 inches!