When driving on road trips or driving long distances it's recommended to take a 20 to 30 minute break if possible for every 2 hours of driving time.
Driving 2 hours at a time can get very tiring and your legs and feet may also fall asleep.
You need to pull off the road and take a break and walk around, eat something, check your vehicles fluids etc before getting back on the road.
I usually drive only about 1 hour at a time and then pull off the road into a gas station or other rest area to take a break and get some gasoline.
I stay there taking a break for at least 20 minutes and walk around and then get back on the road again.
I've tried driving 2 hours at a time and I got so tired and almost went off the road one day.
So I drive only 1 hour to 1 hour and 30 minutes at the most and then take 20 to 30 minute breaks.
I'm usually in no hurry to get to where I'm going especially if I'm on a road trip for fun.