Arcane Gate

As in the Player's Handbook with the following added:

At Higher Levels. When you cast this spell using a spell slot of 7th level, the duration is concentration, up to 1 hour. When you cast this spell using a spell slot of 8th level, the duration is 24 hours, without requiring concentration. When you cast this spell using a spell slot of 9th level, the spell lasts until dispelled. Whenever you cast this spell using a spell slot of 7th level or higher, the range that the second point can be from you increases by 500 feet for each slot level above 6th.