3 times a week Ex roulette = 225 tomes

2x each Midan floor = 80 tomes

1x Void Ark = 20 tomes

3 times a week lvl60+Trial = 75 + (something between 30 - 60)
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430-460 tomes. And that's not much to do for a whole week.

If you do Savage, Sephiroth Ex, Bismark Ex, Ravanah Ex, Thordan Ex, PvP, beast tribes (Gnath) or hunts, it's less.

May I ask what content you do enjoy?