[RPG] Is “lasts until dispelled” a duration

dnd-5edurationpermanencyspells

Some spells, like true polymorph, has language that says (emphasis mine)

If you concentrate on this spell for the full duration, the spell lasts until it is dispelled.

This seems to suggest that the duration is over and the spell simply lasts until dispelled. If you are looking at the rules around Combining Spell Effects, does "lasts until dispelled" count as a duration? Or is it outside of that mechanic and the spell actually has no ongoing 'duration'?

Best Answer

Yes

Player's Handbook, p.203, "Duration":

A spell's duration is the length of time the spell persists. A duration can be expressed in rounds, minutes, hours, or even years. Some spells specify that their effects last until the spells are dispelled or destroyed.

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