91 days after the April 10 peakClearly this bubble collapse is becoming more similar to the 2011 collapse than was the case a month ago.
Speculative financial bubble theory says that a collapse takes about the same time as the speculative inflation. Initially, I believed that this bubble started in January, but another interpretation of the price chart allows for the bubble to start last October - a six month inflation. A six month collapse would end in the September - October timeframe. I drew the long term support trendline in green, and added the support line of the June 2011 peak, and drew a black trendline extrapolating the current decline.
Evidence and experience drawn from the comparison of this bubble with 2011, and bubble theory makes me believe that the bottom will occur in September or October. The price then should be above $32 and below $50. The lines intersect at approximately $40.
Assumptions include the continuation of the two year long term support rate of growth. If the bitcoin economy rate of exponential growth has decreased, the the collapse could well undershoot the target. The previous peak of $32 should provide support according to Elliot Wave Theory. Bubble theory, on the other hand, allows for prices to collapse back to pre-bubble levels, e.g. $10.
The expected duration of the collapse is indeed important. Looking at bitcoin the collapse in 2011 took 5 months. How long took the exponential bubble inflation? Your chart above shows it was only 2 months in 2011, in April and June. So the collapse took considerably longer than the period of exponential rise. This seems to have been true also for the smaller bubbles. The 2011 november-december exponential rise took 2 months also, the following correction took 5 months before hitting the long term trendline again. The next exponential rise was from June till July 2012, also just 2 months, after which it corrected/flattened for 5 months too.
What's different in the recent exponential rise is that it went up for 3 months before correcting. Which is 50% longer as the previous ones. Considering corrections took more than double the time of the rise in the past (250% longer), that would bring the current correction at 3 months x 250% = 7.5 months, or around november-december. By then however the trendline will be above $50. And since it tends to go up strongly after the bottom is reached, never to see that price again, I think it will be important to buy at such time.
Fingers crossed history repeats