Long time EV drivers don’t stop at a charger & completely charge to 100% because of the way that batteries work.
The fastest charging is at the lower states of charge, so 10-80% charge will very likely take less time than 80-100%, my own EV charges upto 27% at 100kW, then upto 52% at 72kW, then upto 72% at 54kW, then upto 84% at 27kW, then it gets really slow, seeing 13kW, then 7kW & the last 2% at 3kW. You’d unplug from the DC rapid & plug into a 7kW AC post to achieve 100% where the car is trying to balance the battery.
So, for me, I’ll try to stop at 10-15% SoC & charge until I reach 72%, then I’ll set off to my next charger/destination, I’m not going to sit around on a rapid or ultra rapid charger blocking others from charging for the rest of their journey, that would be incredibly rude & selfish & is why rapid chargers have overstay penalties. As my car will do 10% to 80% in 30 minutes on the right ultra rapid charger then that’s the range I work in. Hopefully the next generations of these EVs will charge much faster, we are already seeing that in Tesla/Porsche/Hyundai.
I tend also to charge to 100% on my home charger the night before a long journey so I set off with the maximum range. It’s also worth knowing that it’s best not to leave these batteries at 100% SoC for too long (a few hours after reaching the 100% before a journey is fine, a few days will degrade the battery).