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Honestly, it's really a matter of personal preference. I try to get something stable out once a month or two with the popular apps and if there's an urgent fix, I try to get that out within a week of a previous update.
It's up to the apps stability and your satisfaction with its current state.
Jerome Carty - @jcarty | #webworks-dev / #BlackberryDev on irc.freenode.net | My Apps Click "Accept as Solution" if post solved your original issue.. Give like/thumbs up if you feel post is helpful