> Though I think that such observations would require at least two years

It is at least two years at least if I'm understanding this⁰ correctly:

Observational concept

Ultra-high precision, long (at least two years), uninterrupted photometric monitoring in the visible band of very large samples of bright (V ≤11-13) stars.

⁰ https://sci.esa.int/documents/33240/36096/1567260308850-PLAT...