@Override protected void invalidated() {
                    if (get().getSeconds() > getMaxTimePeriod().getSeconds()) {
                        setMaxTimePeriod(get());
                    }
                    fireTileEvent(TIME_PERIOD_EVENT);
                }
Defines the duration that should be used for the data shown in the TimelineTileSkin
@param PERIOD
src/main/java/eu/hansolo/tilesfx/Tile.java