Yes, it takes hours te rebuild all.
I just rebuild one of my gentoo systems (in the course of upgrading gcc from 2.95.x to 3.x) and that rebuild took more than a full day (the magic command is emerge -e world), on a Athlon 1.33 GHz.
It is still manageable though, just type the command and go do something else...
This is a full workstation installation (including Xfree, KDE, Koffice, Mozilla as the largest packages; not with OpenOffice, that takes almost a day by itself...).
down: SCO Group SCOX 10.93 -0.28
I guess that sums it all up...up: Intl Bus. Machines IBM 84.50 1.75
It is still manageable though, just type the command and go do something else...
This is a full workstation installation (including Xfree, KDE, Koffice, Mozilla as the largest packages; not with OpenOffice, that takes almost a day by itself...).