Top 5 Uptime's by OS:

+-----+------------------------------------+-----------------------------+
| Pos |                                 OS |                      Uptime |
+-----+------------------------------------+-----------------------------+
|  1. |                Linux 3.2.0-4-amd64 |  3 years, 5 months, 23 days |
|  2. | *Linux 3.10.0-1160.15.2.el7.x86_64 | 1 years, 12 months, 15 days |
|  3. |   Linux 3.10.0-957.21.3.el7.x86_64 |  1 years, 7 months, 13 days |
|  4. |           FreeBSD 10.1-RELEASE-p16 |  1 years, 5 months, 23 days |
|  5. |               FreeBSD 10.2-RELEASE |  1 years, 3 months, 11 days |
+-----+------------------------------------+-----------------------------+