I don't really know, I don't have a lot of experience with feeds (but hopefully someone else will chime in). I don't think the cache time will matter too much - probably best to leave it something other than 0, but if you don't have too much traffic (and I assume not too many people requesting your feed) then it probably doesn't matter. As for cutoff, if you set that to something high someone who monitors your feed for the first time will get old threads, so I guess it's up to you whether or not you want that.
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