Lightly used mongrel process - mysql connection

I noticed that in one of my apps that are lightly used, we had a
background process that would only contact the DB if some condition
was met. If not, it would not contact the DB. It could go for days
without establishing a connection to the DB. And then, when it was
finally time, the process would blow up because I would get a
connection timed out error. I understand this now, and have
reconfigured the background process.

That lead me to think of some issues we have seen with lightly used
apps and the mongrel processes we have. If the app is rarely hit, and
let’s say I have three mongrels setup, it is conceivable that at least
one of those processes could go for a long time before contacting the
DB.

Does that time out? Or does Mongrel have some keep alive built in
already?

Thanks.