Conjure Device (PT)

You create a mechanical device with which you are familiar. The device is in perfect working order and fully fueled or loaded, as the case may be

At Higher Levels. If you cast this spell using a spell slot of 5th level or higher, the duration is concentration, up to 1 hour. If you use a spell slot of 6th level or higher, the duration is 8 hours. If you use a spell slot of 7th level or higher, the duration is 24 hours. If you use a 9th-level spell slot, the spell lasts until it is dispelled. Using a spell slot of 6th level or higher grants a duration that doesn’t require concentration.