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Player Core / Chapter 7: Spells / Durations

Long Durations

Source Player Core pg. 302 2.0
If a spell’s duration says it lasts until your next daily preparations, on the next day you can refrain from preparing a new spell in that spell’s slot. (If you are a spontaneous caster, you can instead expend a spell slot during your preparations.) Doing so extends the spell’s duration until your next daily preparations. This effectively Sustains the spell over a long period of time. If you prepare a new spell in the slot (or don’t expend a spell slot), the spell ends. You can’t do this if the spell didn’t come from one of your spell slots. If you are dead or otherwise incapacitated at the 24-hour mark after the time you Cast the Spell or the last time you extended its duration, the spell ends. Spells with an unlimited duration last until counteracted or Dismissed. You don’t need to keep a spell slot open for these spells.