Here you can see all significant corrections in the last 5 years on Nasdaq (IXIC). My idea was to analyse how long they last, in what % do they fall and long it takes to recover.
In the last 5 years, the fall of correction lasted 29 days on average. And, in value, -14.2% on average.
This average data, applied on the current correction that started on 12 Feb 2021, give me the forecast that we will hit the bottom of this actual correction on 13 March 2021.