A little bit off topic, but I too have experienced this, and I have to say, it's awful for productivity, team building, and team assimilation. As a new hire, I would send my mentor a question and it might be ten minutes to fifty minutes before I would get a reply. By then, I'd all but forgotten what I was asking about in the first place, since I had moved on because of not knowing how long I'd have to wait. That led to wasted time and an overall loss of focus.
No matter the environment, text-based and asynchronous communication just aren't very effective compared to spoken communication, even when considering the interrupted party momentarily losing their flow.