Time it took for bitcoin to add a zero to its exchange price:

$100 - $1,000: 1,015 days
$1,000 - $10,000: 1,789 days
$10,000 - $100,000: 2,563 days

Each period took 774 more days than the previous period. If this trend holds, bitcoin would hit $1m in 3,337 days - Aug 25, 2034.