How do I change the default idle timeout for autofs?

The default timeout for autofs is 300 seconds (5 minutes). After five minutes of inactivity, a filesystem that is mounted will be automatically unmounted. This is a typical safe value. If it needs to be changed, then a different value can be given in the /etc/auto.master. This value is given in seconds.

For example, the following line indicates the directory is not to be un...