Right. It's just a count of the total number of ticks your device has been up. If the uptime is 2 seconds, sysUpTime.0 will be 200. You can extract a human readable number pretty easily with some math.

#!/usr/bin/perl

use strict;

# Calculate ticks per second, minute, hour, and day
my $TICKS_PER_SECOND = 100;
my $TICKS_PER_MINUTE = $TICKS_PER_SECOND * 60;
my $TICKS_PER_HOUR   = $TICKS_PER_MINUTE * 60;
my $TICKS_PER_DAY    = $TICKS_PER_HOUR * 24;

sub tick2time
{
        my $ticks   = shift;
        my $seconds = int($ticks / $TICKS_PER_SECOND) % 60;
        my $minutes = int($ticks / $TICKS_PER_MINUTE) % 60;
        my $hours   = int($ticks / $TICKS_PER_HOUR)   % 24;
        my $days    = int($ticks / $TICKS_PER_DAY);

        return ($days, $hours, $minutes, $seconds);
}
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-Matt