Depends on what you're using eZ publish for and how it is used. If there is a lot of traffic and huge transactions then you might have to increase the PHP memory limit. Bad/unoptimal template code usually leads to more memory being used. Try 16,24,32,48 or 64MB; however, according to some people here 16 is usually enough for "normal" sites.
Balazs
PS: Cronjobs might eat a lot of memory.
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