So since an Arcanist can use his arcane Reservoir to boost his CL by 2 with potent magic, does that mean a level 13 Arcanist can put a 5th level spell on himself through contingency, as he'd be treating his caster level as if it were 2 levels higher, and it would last for 15 days?
That would be my understanding, yes.
I Agree, that makes sense