I see a bullet point for "1.0 days of 1.3 days", and when I mouse over the previous day (Wedensday 2025-11-19), I see "7.8 hours of 1.3 days".

I haven't actually checked any sources to confirm there really was downtime on those days, but if we assume those numbers are true 7.8 hours + 1 day is about 1.3 days.