Active Queries

How long are active queries allowed to remain active? I have some broken queries that are taking up database connections on the status page. They’ve been active for over two hours. The clients these queries came from are shut down. Is there any way to kill them from Ignition?

This is Ignition 7.6.6, Java 7u65

I increased the number of active connections that Ignition could have and this reset the database connection. It looks like things are running much smoother now.