For example some joint non-rated-required joint staff tours or OCONUS non-flying accompanied = 36m
Or some controlled teaching tours are 24, 36, or 48 months...
Or some education programs (i.e. Masters/PhD) could be 24-36m or longer
Or like how the AU Fellowships for IDE/SDE used to be 2+1y =36m (but those were exempted as PME, but did change ones ASC at the HARM...however if you extended in-place too long after PME and your ASC chang(es/ed)....!!!)
....its all tabulated monthly as rated payback and reported to Congress eventually as utilizing rated forces, AND FUNDING, effectively
There is always a 'pumpkin' timer!!..even a personal one, especially noticeable lately in people around ~17 YaS/TAFMSD, those salty, grumpy people...Caveat Emptor!