Actually ,ultear could do it instantly, but many mages have opened the 2nd origin without there knowledge by training and doing missions.It was discovered by the scientists(if you could call them that) that the mages have 2 vessels.Mages like ur, makarov, jellal, laxus, hades, zero, laxus etc might have had already opened the 2nd origin without there knowledge, bcoz it has been already existing from the very beginning ,just the mages didnt knew about it or you could say they didnt have a term for it