I remember the days when i use to install oracle xe , jdeveloper , weblogic , rcu , webcenter , soa suite , bpm suite. It was taking around 2-3 days for me to install
this bunch of software on my laptop.
I did this installation around seven to eight times in last 4 years.
after every new bunch of software version released every few month.
However , My life is easy now and oracle has saved my lot of time by providing
webcenter virtual box which takes around 2 hour to install all stuff that i
want for my current development.
Just google "wecbcenter virtual box" and enjoy the ride.
Thanks to oracle infrastructure people , few of whom i know very well.