MTI has no fixed timelines or ROA. I’ve heard of people getting promoted to SAD within about 2-3 years, while others take 4-5 years or longer. You can be held at SAD for a very long time too.

Also, just to point out, just because titles are similar doesn’t mean the pay grades are the same.

A MTI AD starts at about 3.5-3.8k (fresh grad). In contrast, a MFA AD would be about 6 years in service and would have come back from at least one post - drawing about 10k or so.

MTI SADs draw about high 4 to mid-5.