How Can I Change ping Frequency to every 30 Seconds?

[wiskbroom at hotmail.com]

All;

I would like to modify ping to every 30 seconds over the next two weeks, I believe it is every 5 minutes as that is the frequency shown on my "conn" RRD graphs.  

Is this possible?  Is it possible to change the frequency for just one host and not all of my hosts?

Thank you!

.vadim