lol is it hard posting with such a low comprehension of what you're talking about? Always? Or are you so lacking in IQ that you don't actually know better?
Here, I'll help you. The market gradually lost value throughout the day. It started off down roughly 120-150 points, and this accelerated throughout the day as more economic data came in, and fears of a trade war took off. For folks like you who can't count, that's a 7 hour span.
The meltdown we had a few months ago was nothing like this. The market lost 1,000+ points in the matter of minutes, and then regained 500 of those points in 3 minutes after. But yes, I'm sure that was all due to traders at home rapidly hitting their ETrade sell buttons to the tune of $800B in lost market caps.