3 ms·

I'm thinking 3 months would be ideal

• pjc50 6y ago
  Very few things have a return that quickly. In an era of 25 year mortgages, a 10 year payback is very reasonable.
  • vmception 6y ago
    Let's make these one of the few things that have a return that quickly.
    • Armisael16 6y ago
      That’s unlikely to ever happen; if it’s that cheap to produce electricity the utilities will have long since switched over and cut rates.
• hellotomyrars 6y ago
  Ideal, I guess. Though I don't see how that could ever be possible.