'Override default build hanging detection' — Select this check box if you want to override the default build hanging detection settings. These settings determine when a build hung event is thrown (e.g. you can configure your notifications to trigger from this event). If selected, the following options will appear:

• 'Build Time Multiplier' — This setting is used to calculate the 'Expected Build Time' for the build (i.e. 'Expected Build Time' = 'Build Time Multiplier' multiplied by 'Average Build Time').
  The 'Average Build Time' is calculated by Bamboo by using an average of previous build times.
• 'Log Quiet Time' — This is the amount of time since Bamboo last recorded an entry in the build log for a build.
  The 'Expected Build Time' and 'Log Quiet Time' must both be exceeded for Bamboo to throw the build hung event.
• 'Build Queue Timeout' — This is the amount of time that a build will wait in a build queue before an timeout event is thrown. Setting this value will override the global build queue timeout setting (see Configuring the Job Build Queue Timeout Event).