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RAW, can a caster stack castings of Leomund's tiny hut on the exact same area?
As in, when the remaining duration is greater than the casting time, they would ritual-cast it a second time.
(The motive for needing to do this is to make the hut more resistant to disintegrate/dispel magic. Layered effects need to be taken down one by one, a la the good old prismatic wall).
PHB 205:
The effects of the same spell cast multiple times don't combine, however. Instead, the most potent effect—such as the highest bonus—from those castings applies while their durations overlap.
If your goal is to keep a constant Tiny Hut up without interruptions, then yes, you can cast it multiple times and the spell will constantly stay up--the second hut will take effect as soon as the first one runs out (or is otherwise dispelled or destroyed). However, it does waste a bit of the duration of the second spell, since the clock on the second casting starts as soon as it is cast.
