Mastering a job really depends on the job. Some jobs have more abilities to learn, some have less. The magic classes tend to take a little longer in my opinion (Black, White, Summoner, Red, Time) because there are so many abilities.
But the rewards for mastering a job are great. To have Strength and Stamina of the Knight, Monk, Berserker; Magic of a Summoner/Mage, and the Agility of a Thief or Ninja is enough of a reward for me.
I don't know about any "master jobs", just that you can master each job. Granted, I haven't mastered every single job yet. Just about half of them.
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