public static long
parseTTL(String s) {
	return parse(s, true);
}
Parses a TTL, which can either be expressed as a number or a BIND-style
string with numbers and units.
@param s The string representing the TTL
@return The TTL as a number of seconds
@throws NumberFormatException The string was not in a valid TTL format.
src/main/java/core/org/xbill/DNS/TTL.java