Max bonus with gen 16 and 1450 xp per x1 tick is far enough.
lets do the maths. if 8,700,000 xp is needed for level 31 (1 gen), and you get 1450xp per x1 tick, its 6000 minutes, therefore 100 hours of x1 playing time (with 5 hours a day, thats 20 days, casual playing makes it possible in a month).
And to be fair most people usually have around x2 all the time. I usually have something between x2 and x3
Leveling cannot be more easy...