P.S. 350kw fast chargers are typically being advertised as zero to 80% charge in 15 minutes - cars that can accept these chargers are due in the next couple of years from Audi, Ford, BMW et al so mainstream "ordinary" cars as well as exotica like Porsche. I cant find any stats online, but I have read that the average time someone spends filling up with fossil fuels is 7 minutes, so an extra 8 minutes is not that outrageous and even that is zero to 80% - if you had say 20% remaining I'd imagine that the time would be in the order 10-12 minutes (guesstimate)