External script and large intervals

[FIGARO Nicolas]

Hi, 

I'm running hobbit snapshot from the 26th of august.

I'd like to run an external script on my hobbit server, but only once or
twice a day. 

So the hobbitlaunch.cfg should contain this : 
[my-script]
	NEEDS hobbitd
	CMD ~hobbit/server/ext/my-script
	INTERVAL 4h

I started to configure an interval of 60 minutes, but the status becomes
purple after 20 minutes. 

Is there a way I can tell hobbit to run the script with such interval
without a purple state after 
20 minutes ? 

Thanks 

Nicolas Figaro