When I got the first 6 Epsers on my most recent game I was lvl 30+

But anyways, the lvl 1 (fire, bolt, ice) magics learn at X20, the lvl 2 magics (fire 2, bolt 2, and ice 2) learn at X5? and yeah... it's actually really slow.

It took me 4+ hours to train all my characters at that point to have all the spells those 6 Esper's give.