How many 9's does the suez canal have now? It was down for 6 days out of 151 years? That's 3 9's.
If we include the voluntary shutdown around 6-day war and the yom kippur war[1], we'rd down to 52,000 days, of which 6 were blocked by technical problems, resulting in 3 9's roughly.
Seems like something we'll go back to ignoring soon.