understanding linux last reboot command result

Question

When I ran the last reboot command on linux I receive the following result

reboot system boot 2.6.32-38-server Thu Jun 7 10:54 - 15:22 (04:27)

I need to know what the time 04:27 mean? did the reboot took 4 hours 27 minutes or what?

I tried searching for a description to the last command result but with no luck. Thanks

Answer 1

If you use the -F flag, it becomes clear that it is showing system uptime across the interval shown. This is analogous to the use of last username which shows how long a login session lasted. Since reboot is a pseudo-user in the wtmp file, this is a reasonable way to parallel the output for real users.

Answer 2

It's the difference in time between 10:54 and 15:22, roughly.