Markets don't go in a straight line...many ups and downs come. For those with cash and a long term view, this down move is a great point to add!!
If any investor needs to watch a stock tick-by-tick....they can never create wealth from that stock.
You can't buy for 5 years and get impatient every 5 minutes.
Then each day/week/month/year will feel sooo stretched that you will never be able to hold for the full planned term.