sched and unsched downtime

1 nine : 98.0    - 7.3 days (175.2 hours)
2 nines: 99.0    - 3.65 days or 87.66 hours or 5259.60 minutes
3 nines: 99.9    - 8.77 hours or 525.960 minutes
4 nines: 99.99   - 53 minutes [52.596]
5 nines: 99.999  - 5.26 min [5.2596]
       : 100.00  - 0 hours and minutes