Appropriate size for / root partition

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http://askubuntu.com – I'm about to re-install my system. I like to keep a separate /home and / root partitions. I've been using (K)Ubuntu for around a year now and my / partition (almost 36Gb) never climbed over ~13Gb of used space. What would you say is the appropriate maximum size one should set a / partition to? (HowTos)