He came on a B2 visitor and we did AOS after weighing options, looking at initial wait times being reported at the end of 2021 between fiance and spouse, and concerns with global events at the time. I had evidence between his initial return flight purchase, reschedules of his flight by extending the visit for holidays, and screenshots of our online conversations that there wasn't intent for him to stay originally but we couldn't bear the thought of him returning. The agent was accepting of our verbal explanation when the question came up in the interview and didn't have to present the physical evidence.
Our application was received December 22, 2021.
We did get RFE once for getting his long birth certificate and correcting my financial affidavit form (I missed 3 tiny boxes) which I submitted at same time. Within two days EAD was approved and less than two months for interview to be scheduled.