How Often Does a syndicated RSS feed gets updatd? Can I control that?

[vicpal25]

I created a series of RSS feeds and I have added the option to syndicate the content through various aggregators such as my Yahoo, Google reader, feedburner, etc.

My question is, Once I have syndicated to the content on the aggregator, how often does it refresh the feed to get new content. I tested my feeds by adding new content to the XML files but it does not get updated on the fly. Anyone has any idea of how often does this cycle happen? Thanks.

[NogDog]

Do you have pubDate and lastBuildDate elements for your channel element, and if so, do you update their values accordingly when you update the file? I know this doesn't answer your question as to how often those services check for updates, but it might make a difference. I guess really the best thing would be to check those sites for any FAQs or such that explicitly give you an answer (rather than me just speculating :) ).

[Taschen]

<lastBuildDate>Thursday, 28 May 2006 12:50pm GMT</lastBuildDate>
<ttl>120</ttl>

ttl (in minutes) to auto refresh an RSS 2 feed + build date for users. Hope that's some use.