If you are parking a Telsa on the street for a week at a time, where are you charging it before you park it there? Best is to charge it up the day before you want to use it again, or more often if you exceed the drain time. Also, others have noted that the main battery pack will self-disconnect if you remove/disconnect the 12V battery. So if you are storing it longer term, disconnect the 12V battery, and you'll be better off. I have no idea how long it will/should last if you do that.
Given the difficulty of charging if you only have on street parking, I expect most Tesla owners would reserved parking with access to a charger in that location. In that case, charge it up before storage, and, once a month, charge it up to full. OR just leave it trickle indefinitely.