How many back-and-forths between authors (phd student & supervisor) before article manuscript is submitted?

Hi, I'm a phd student in humanities (experimental linguistics) and currently submitting my second paper to a journal.

I have prepared the manuscript and sent it to my supervisor for feedback. He's the last author, too, so it's a collaboration, not just supervision.

As expected, he responded to me next day, with feedback in the word document track changes & comments, including comments that were formulated as questions. I replied to his questions in the same word document, implemented most of his suggestions, motivated why I'm reluctant to implement some other suggestions. Sent the file over next day. However, I got no reply to this for two days (he's a quick responder, usually), and then he wrote just this: "so aren't you submitting?" I replied that I was waiting for his reply and more discussion or ar least a confirmation that he's fine with me dismissing some of his ideas. But he didn't want to engage in a second round of feedback.

The same happened with my first article. Back then I thought that he was maybe too busy and didn't ask him for explanation, just submitted. It was just before summer break so I forgot to pick this up wen we met at the university in autumn. But now the pattern repeated itself and I wonder whose implicit expectations are more unusual - mine or his.

For context: the manuscripts were ~10 000 words with refs and captions. Revision stage, so reviewer opinions had to be accomodated. Papers reporting experiment results. Track changes on all the time. The unresolved changes that I expected a second round of feedback on were 6 items (one terminology choice, one phrasing, one disagreement about which source should be cited, which figures should be merged (journal limits figure count), which should go to supplementary material (related to a reviewer's request), and one figure which I included as per reviewer's wish but my supervisor then wanted to remove). So it's not much, but definitely not inconsequential.

Question then: is this normal? How many back-and-forths do you usually end up with? Does it differ if there are other, minor co-authors that should check the final manuscript before submitting?

Thank you.

P.S. I am going to discuss this with my supervisor directly this Monday, of course. We have a good relationship and I know it's best to clear things up between ourselves. We just happen to have a lot of implicit agreement and it's weird when such a mismatch pops up. I ask here mainly to get some context, how it looks in academia in general. Thank you.