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PFS StandardReprepare Spell Feat 18

Wizard 
Source Player Core pg. 205 2.0

You’ve discovered how to reuse some of your spell slots over and over. You can spend 10 minutes to prepare a spell that you already cast today, regaining access to that spell slot. The spell must be of 4th rank or lower and can’t have a duration. You can reprepare a spell in this way even if you’ve already reprepared that spell previously in the same day.

If you have the spell substitution arcane thesis, you can instead prepare a different spell in an expended slot, as long as the new spell doesn’t have a duration. You can use spell substitution on that slot again, but you remain restricted to preparing only spells without a duration in that slot until the next time you make your daily preparations.