last performance test should use larger units than hours whenever applicable

[Anton Eliasson]

I did a performance test on one of my disks around September last year. Disk Utility reports that this was done "7587 hours ago". A more useful way to present this information would be in the form of "(0 years,) 10 months, 16 days and 3 hours ago". Years should not be shown in this particular example, since it is equal to zero.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gnome-disk-utility 2.32.1-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: c43a19076448baad41c3944df9d92f15
CheckboxSystem: 533a8038ef5a55601694b49142442fa7
Date: Wed Jul 13 23:52:53 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 LANGUAGE=sv_SE:en
 PATH=(custom, user)
 LANG=sv_SE.utf8
 SHELL=/bin/bash
SourcePackage: gnome-disk-utility
UpgradeStatus: Upgraded to natty on 2011-04-28 (76 days ago)