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And regarding "impeding the charging rate", any extension cord will reduce current. In this case, you'd need a lot more than 100' of NEMA 14-50 to get even close to dropping it to a 110V rate.
The tesla rep who was there said they are hoping to have NH, Shoppers World, and Mansfield all ready before the weekend. Lots of pressure to be there for the weekend before he holiday. He thought Mansfield might slip though.
Big news! Per the guy working on the site, go-live is TOMORROW! They are pulling the line from the street to the transformers as I write this. The meter is jumpered. Tesla only signs are up. He said the line is slated to be spliced tonight but rain may delay.