Sure, given the context being in kilometers instead of miles I was using the ~130km/h that is common in a lot of European highways. From experience that gets you less than 350, particularly in winter. Some places (and drivers) are quite a bit faster still. US highways have fairly low speed limits and so range is less of an issue.

True parity with gas will take a much longer time. My previous diesel car had almost 4 times the range and could be refueled in 5 minutes. But there are other advantages that cover for that. Which is why my estimate is that 5-10 years depending on location is what will be needed for both the offer of models and the charging infrastructure to all be in place.