public void
setTimeout(int secs) {
	if (secs < 0)
		throw new IllegalArgumentException("timeout cannot be " +
						   "negative");
	timeout = 1000L * secs;
}
Sets a timeout on this zone transfer.  The default is 900 seconds (15
minutes).
@param secs The maximum amount of time that this zone transfer can take.
src/main/java/core/org/xbill/DNS/ZoneTransferIn.java