From 2013 all time highs to 2017's there was a 1500% increase.
From 2017 ATHs to 2021's there was a 300% increase.
Considering the percentage of reduction from ATH to ATH on a logarithmic scale and Bitcoin's scarce nature then I guess that the next increase in price should be about 80% from last ATH. So 70k + 80% = 126k
Regarding the timelines between each ATH they are roughly the same so no need to change that value of around 50 months between each all time high.