$ uname -a
Linux localhost 4.4.34-1-lts #1 SMP Mon Nov 21 21:15:49 CET 2016 x86_64 GNU/Linux

$ time LC_ALL=C sudo pacman -Su
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...

Packages (2) linux-ck-sandybridge-4.8.11-1  linux-ck-sandybridge-headers-4.8.11-1

Total Installed Size:  113.64 MiB
Net Upgrade Size:       -8.18 MiB

:: Proceed with installation? [Y/n]
(2/2) checking keys in keyring                      [---------------------------] 100%
(2/2) checking package integrity                    [---------------------------] 100%
(2/2) loading package files                         [---------------------------] 100%
(2/2) checking for file conflicts                   [---------------------------] 100%
(2/2) checking available disk space                 [---------------------------] 100%
:: Running pre-transaction hooks...
(1/1) Remove DKMS modules
==> dkms remove vboxhost/5.1.10_OSE -k 4.8.9-3-ck-sandybridge
:: Processing package changes...
(1/2) upgrading linux-ck-sandybridge                [---------------------------] 100%
>>> Updating module dependencies. Please wait ...
(2/2) upgrading linux-ck-sandybridge-headers        [---------------------------] 100%
:: Running post-transaction hooks...
(1/2) Install DKMS modules
==> dkms install vboxhost/5.1.10_OSE -k 4.8.11-1-ck-sandybridge
(2/2) Updating linux-ck-sandybridge initcpios
==> Building image from preset: /etc/mkinitcpio.d/linux-ck-sandybridge.preset: 'default'
  -> -k /boot/vmlinuz-linux-ck-sandybridge -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-ck-sandybridge.img
==> Starting build: 4.8.11-1-ck-sandybridge
  -> Running build hook: [systemd]
  -> Running build hook: [autodetect]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
  -> Running build hook: [filesystems]
  -> Running build hook: [fsck]
==> Generating module dependencies
==> Creating uncompressed initcpio image: /boot/initramfs-linux-ck-sandybridge.img
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux-ck-sandybridge.preset: 'fallback'
  -> -k /boot/vmlinuz-linux-ck-sandybridge -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-ck-sandybridge-fallback.img -S autodetect -A sd-vconsole,keyboard
==> Starting build: 4.8.11-1-ck-sandybridge
  -> Running build hook: [systemd]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
==> WARNING: Possibly missing firmware for module: wd719x
==> WARNING: Possibly missing firmware for module: aic94xx
  -> Running build hook: [filesystems]
  -> Running build hook: [fsck]
  -> Running build hook: [sd-vconsole]
  -> Running build hook: [keyboard]
==> Generating module dependencies
==> Creating uncompressed initcpio image: /boot/initramfs-linux-ck-sandybridge-fallback.img
==> Image generation successful
LC_ALL=C sudo pacman -Su  42,40s user 2,85s system 24% cpu 3:06,41 total