It's a very rough assumption based on past market runs. Monero went from about $3 to $15 last year (5x increase), from about $12 (March 10th) to a high of $60 earlier this year (5x increase), then from $30 on July 16th to $150 (5x increase). So if our last strong support was at $85 then I'm predicting our next 5x run will bring us to $425, which should happen no later than December 15th (45 day interval).

EDIT: Also, the Nov. 1st 2016 run from $4 to $18.5 almost fits the pattern.