presto-main/src/main/java/io/prestosql/execution/TaskManagerConfig.java/TaskManagerConfig/setLevelTimeMultiplier
class TaskManagerConfig:    @Config("task.level-time-multiplier")
    @ConfigDescription("Factor that determines the target scheduled time for a level relative to the next")
    public TaskManagerConfig setLevelTimeMultiplier(BigDecimal levelTimeMultiplier)
    {
        this.levelTimeMultiplier = levelTimeMultiplier;
        return this;
    }