Hello Marcet!
I'm actually a big Cyanogen fan, it's just that combining the words "nightly build" and "work phone" makes me itchy 
Anyway, the sync days option is valid for both emails and calendar...
You can check your /opt/zimbra/log/sync.log file for a line like this:
Code:
Ping: Getting items older(or newer) than 31 days for type: 11 on folder: /Calendar
Recurring events, on the other hand, are handled differently by different clients, and Android's stock calendar app usually shows them all regardless of the sync timespan.
Have a nice day,
Cine
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