Credit to Elon Musk, he got millions from the gov't to start Tesla, and paid it back, but then went to Goldman Sachs for more. And yes there are the supercharging stations, and the stations where you just get a new battery pack installed, you don't get back the battery pack you started with in return.
The expectation has been that you go out and back the same path - you do get your battery back, charged and ready to install. If you don't do that, that's ok. I would make it a point to return if I were gonna swap it out. Just stop at a place 20 miles from home, swap it out, then come back within 20 miles on the way back.
Would rather take a little break from time to time to charge. Gonna want to stop sooner than 170 miles anyway.