How long does it take to compile a kernel (linux 3.2.5)?

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http://askubuntu.com – How long does it take to install kernel (linux 3.2.5) on 12.04 using make install -j 4 command? My terminal is displaying this for around 40 minutes now. root@user-desktop:/usr/src/linux-3.2.5# make install -j 4 sh /usr/src/linux-3.2.5/arch/x86/boot/install.sh 3.2.5 arch/x86/boot/bzImage \ System.map "/boot" run-parts: executing /etc/kernel/postinst.d/dkms 3.2.5 /boot/vmlinuz-3.2.5 (HowTos)