static double GetMaxBACKEndCompletionTime() {
		double ret = systemClock.getCurrent();

		if (sessionList.size() > 0) {

			for (int i = 0; i < sessionList.size(); i++) {
				if (sessionList.get(i).getBackEndCompletionTime() != Double.MAX_VALUE) {
					if (sessionList.get(i).getBackEndCompletionTime() >= ret) {
						ret = sessionList.get(i).getBackEndCompletionTime();
					}

				}
			}
		}

		return ret;

	}