code: static final int guessLengthFromName(String aName) {
  		
  		if (aName.startsWith(Constants.PREFIX_SNAPSHOT_INTERVAL))
  			return -1;
  		
  		int unitFactor;
  		int value;
  		
  		try {
  			value = Integer.parseInt(aName.substring(0, aName.length() - 1));
  		} catch (NumberFormatException e) {
  			throw new UnknownIntervalLengthException("Unsupported Interval name format: " + aName);
  		}
  
  		char lastChar = aName.charAt(aName.length() - 1);
  		TimeUnit unit = lookupMap.get(Character.toLowerCase(lastChar));
  
  		if (unit==null)
  			throw new UnknownIntervalLengthException(aName + ", " + lastChar + " is not a supported unit.");
  		
  		unitFactor = unit.getFactor();
  
  		if (value == 0)
  			throw new UnknownIntervalLengthException(aName	+ ", zero duration is not allowed.");
  
  		return value * unitFactor;
  	}
docs: This method parses the given Interval name and returns the length of such an Interval in
  seconds.
  
  @param aName the name of the Interval
  @return the appropriate length
  @throws UnknownIntervalLengthException if the name could not be parsed