If the UMC turns out to be not enough, you can always add the twin charger (the extra space is already there in the car and according to a rep the charger can be added afterwards) and HPWC later.
The Tesla website has a neat calculator that you can calculate charge time by inputting miles and selecting the charger you have (click the calculator section):
http://www.teslamotors.com/models/charging#/calculator
If you input 240 miles (the advertised ideal range of the 60kWh pack) you get 7:32 for the time and 67.9kWh of energy from the socket when you select a 14-50 socket and single charger. You can play around with the tool to see if it will work for you. Just keep in mind the range specified is ideal range, so you may want to adjust for the fact that 300 miles in ideal range is equal to 265 miles of EPA range.






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