Exactly. For 800 km/day (500 miles), your typical gas car will need to be fueled anywhere from 1-2 times depending on the car (typical gas cars might go 200-450 miles between fillups). Typical fuel stop might take 15 minutes at best assuming you also need to stop, use the restroom, grab a drink/snack, etc. A Model S with 200 miles range between SuperChargers will also need to be filled 2 times - but you'll need about 90 minutes of charging, or about 60-75 minutes longer than a gas car.
A 500 mile trip, you may travel 70 mph while on the road, so lets say 7 hours of driving. The gas car might take about 7.5 hours including stops at best, a Tesla might take up to 8.5 hours.
Is that extra hour hour or so going to kill that occasional trip? Highly doubtful, but if it is, I suggest that a plug-in hybrid like the Chevy Volt might be a much better fit for that type of use.