Disclaimer: I own Tesla shares. Tesla has a long history of taking far longer and far more money to achieve a goal than they forecast. They don't show signs of adjusting their forecasts based on previous misses. For the last couple of years the market has given them a pass for that when the market has punished other companies for far less. Tesla has gone to the well again and again to raise money. One concern is that if market support drops, they may not be able to go to the well again. And history suggests that they will need to and will miss their revised goal as well.