> Sure, it doesn't have to be 5 minutes - even 10-15 would be enough - but current chargers don't get anywhere close to that

My car has a 83 kWh battery and charges at 150 kW, which, for 20% to 80% (what you want to generally do on a trip) means 20 minutes. 20 minutes of charge gets me 300 km, and I generally definitely want to stop for 20 minutes every 300 km or so.

I don't see how that's not "anywhere close" to 15.