Plural of downtime; periods when a machine, system, or business is not operating or is experiencing reduced activity.
Compound of 'down' (not functioning) and 'time,' originating in industrial and computer terminology in the 20th century.
Every online service you use calculates 'downtime' in fractions of a percent—even 99.9% uptime means your favorite app is broken for almost 9 hours per year.
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