Difference between Astral Projection and Window

[Alneyan]

Astral Window is also a standard spell of Arcoscephale, and is perfectly safe for the caster.

The duration of Astral Window is 2 or 3 turns per casting, plus one turn per additional pearl. Once the spell is cast, the caster can do something else.

I have never tried Arcane Projection as you can see; in most cases where I would have killed for information, the other side had Astral Mages of her own, so.