If dbcheck slow mode activated, XYmon becomes purple

Hi,

I'm using dbcheck.pl to monitor my Oracle database but check them every 30min produce too much overload. I used dhcheck slow mode (every 2h) but this a way too long for my Hobbit server : the db color switch to purple. Is there a way to define the among of time before the server switch to purple? Any other ideas is also welcome on dbcheck tweaks.

Thanks by advance,

LMJ