Biztalk 2006

HI,
I am new to biztalk server.
I am using Biztalk as middle tier in my application which acts as interface between my application and other application which fetches data which has to be displayed in my application.
So each time user makes a request the request will be forwarded by Biztalk orchestrations to the other application and fetches the data.
Some times it happens that the response may not come within the timeout interval of my website and then i am displaying a userfriendly message to the user.

Now the problem is as such cases increases all the suspended and dehydrated instances in the biztalkserver is getting increased and my system is running low of memory and not able to perform any action. then i have to go and terminate all the instances again to make the system running.

How can i teminate all the suspended and dehydrated instances automatically after a certain interval of the instance has been dehydrated or suspended without manual interaction.

Can any one help me in this

Thanks in Advance.