Spell penitration: How much is enough?

[Seliana]

So 43 as a theoretical cap after U9, but it requires 6 TRs. I'm sorry, but that doesn't count as doable in my book.

+1 Scholar of the Twelve - Guild Airship buff
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44

[ImFour20]

So 43 as a theoretical cap after U9, but it requires 6 TRs. I'm sorry, but that doesn't count as doable in my book.

dont forget, whatever your base spell pen is, you get a roll added to that(1d20 i assume)