if you can charge it to top it off between sessions, you will be golden, go for a late 2013 through 2015 model as LeftiBiker mentioned, my experience confirms that those batteries last longer. if the plugs you are talking about are at the office then they are probably 6.6kw rated sockets, so half an hour of charging will give you about 12-15 miles of range as a good rule of thumb. DC chargers (fast chargers) have huge plugs and make noise while they charge (they have some big fans inside)
if you can't charge it, then driving around all day will make it tricky to hit 70 miles in every use case, even if you are mostly at lower speeds. I very easily have 60 miles of highway range on my car at 93% health, the longest trip i made was 85 miles and i wasn't turtling yet.