Depending on how much you drive and if there is a convenient supercharger nearby.
Here comes a bunch of back of the napkin extrapolation:
Model 3's efficiency is 4.1 miles per kwh. So in order to get $1800 worth of supercharging you would need to charge up at least 1800/0.33 = 5454kwh. Which translates to roughly 5454/4.1 = 1330 miles. Which translates to 3 to 4 miles per day. If we count only weekdays (work commuter), and taking out 2 weeks (away on vacation, holidays etc), 5*50 = 250 driving days. 1330/250 = 5 to 6 miles per day.
Big caveats, this assumes exclusively supercharger charging, and assumes 33c per kwh supercharger rates. Which is what it is around here. This also assumes flat 4.1 kwh efficiency, which in real life is usually different. Another HUGE caveat, is that you can typically charge for a lot cheaper (with solar for as little as 0 to 2 cents per kwh depending on if you are pulling from utility at night or not), with TOU plans without solar for 14 to 23c kwh. Charging at work locations is often free or as low as 12 to 15c kwh. Even public charging is typically under 20c kwh (level 2). So the caveat being is that supercharger costs a lot more % wise than alternate ways of charging. Which in turn makes it so that you break even at much fewer miles charged. If for instance you can charge elsewhere for 15c kwh, then the 5 to 6 miles per day goes up to 10 to 12 miles per day. If you can charge for free (workplace or solar) then supercharging would not be worth it at all, unless you do roadtrips. So its really dependent on your personal driving situation.
Hope that helps a little bit.