abetterrouteplanner.com finds a round-trip route for her journey that requires 2.5 total hours of charging, while never dipping below 10% charge or above 61% (subject to assumptions about what exact model vehicle she had). The screen in the Tesla will show you in real-time which stations are open, and even how many spots are free, although I don't know how well they indicate future closures. Tesla's navigation interface will also do automatic routing through superchargers, but I personally like the web interface better.