Uptime counting depends largely on the specific operating system. Mac OS X counds uptime as the time between reboots, and includes time spent sleeping in that.
On the same hardware though, Gentoo Linux counts uptime as time spent between reboots, and excludes sleeping. I had my PowerBook G3 turned on, but sleeping for about a week, and it reported an "uptime" of about ninety minutes. I used it for an hour, and it then reported an uptime of about 2 hours 30 minutes.
I think long periods of reliability, even with shutting down at night, is more impressive than long periods between restarting, which with modern mobile computers, can be artificially stretched. Also, it shows that the machine is, in generally, "ready to be used" more often, whereas less reliable systems tend to need a lot more work than well-maintained systems.
I know because I've taken care of Windows systems that aren't well-maintained, and I end up reformatting two or three of them every few months, because some people don't know what to do to keep them running properly.
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On the same hardware though, Gentoo Linux counts uptime as time spent between reboots, and excludes sleeping. I had my PowerBook G3 turned on, but sleeping for about a week, and it reported an "uptime" of about ninety minutes. I used it for an hour, and it then reported an uptime of about 2 hours 30 minutes.
I think long periods of reliability, even with shutting down at night, is more impressive than long periods between restarting, which with modern mobile computers, can be artificially stretched. Also, it shows that the machine is, in generally, "ready to be used" more often, whereas less reliable systems tend to need a lot more work than well-maintained systems.
I know because I've taken care of Windows systems that aren't well-maintained, and I end up reformatting two or three of them every few months, because some people don't know what to do to keep them running properly.
_________________
[Insert Cool Signature here!]