There is something wrong with that Autotrader calculation.
2.3Kw to 100% = 43h
7.4Kw to 100% = 12h36
22Kw to 100% = 9h18
50Kw to 80% = 1h25
100Kw to 80% = 0h50
The 22Kw figure makes no sense. I think the car has a 90KWh battery. You are much more likely to charge it to 100% at home. So 90KWh/2.3Kw = 39 hours, right sort of ballpark. 90KWh/7.4Kw = 12.16h, again about right. 90KWh/22Kw = 4.09 hours, so should be more like 4.5 hours.
If you're going on a long trip you typically plan to get down to about 10% charge, and then charge them back up to 80%. The batteries do not charge at a constant rate - the charging starts to tail off once you go past 50-60% charge, and the bit between 90% and 100% takes forever. So it is usually quicker to stop again and take two 45% charges rather than one 90% charge.
However, what this really means is that the advertised 100%-0% range of 279 miles is in reality a 100%-10% range of 250 miles for the first stint (starting from home), and then subsequent stints of sub 200 miles (80%-10%), and stops of around and hour to charge in between. And that's assuming the 279 mile range is realistic in the first place, which it probably isn't.
An 600 mile trip therefore typically needs 3 charges, so 3 hours. Most petrol cars can do the trip with one stop for fuel (say 15 minutes), and a Diesel car could probably do it without stopping at all.