https://twitter.com/aetos382/status/1250645758031753217

JenkinsBuildTimeSummary.groovy

Jenkins.get().allItems.findAll {
	
  it instanceof hudson.model.Job<?, ?>

}.each {
  def build = it.lastBuild
  
  while (true) {
    if (build == null) { break }
    if (build.timestamp.get(Calendar.MONTH) <= Calendar.MARCH) { break }
    
    build = build.previousBuild
  }
  
  def duration = 0;
  
  while (true) {
    if (build == null) { break }
    if (build.timestamp.get(Calendar.MONTH) <= Calendar.FEBRUARY) { break }
    
    duration += build.duration
    
    build = build.previousBuild
  }
  
  println(new Tuple(it.fullName, duration))
}