75 is too fast too soon. I expect a consolidation around 60-65, maybe a few minor spikes trying to break up but with no real momentum.
I was wrong last week in predicting a drop after a rise to $60. I don't see where such a drop to $51 would come from now. If I see any prices below $55 - $56, I'm buying more; and I expect many others will do so too. Ultimately most won't be that quick so prices that low are unsustainable.
That said, I think $100 is do-able in under 9 weeks. 9 weeks at the latest. 3-4 weeks is quite a likely scenario too.