Hello, in the uptime calendar our notebooks are all shown that they are in sleep mode, even if they were shut down. This problem seems to be only with Windows 10. Notebooks with Windows 7 are shown correctly.
Windows 10 by default NEVER shuts down entirely. You have to deactivate fast boot if you want to have correct information again. Win10 Disable Fast Boot
Btw. I didn't get a significant change in boot time after disabling this but it may vary, my Windows 10 is only 3 days old.