Check mail and rss at different intervals?

[moabi2000]

Hi,

I use (gnus-demon-add-handler 'gnus-group-get-new-news 30 nil) to
check for new mail every 30 minutes. I have recently added some rss
feeds as well, but would like them to be checked less frequently
(otherwise gnus freezes as it checks each feed, especially when I'm on
a slow net connection). Is there anyway to specify separate intervals
either based on group type (imap vs rss)  or group name?

Thanks for your help
M.