In short episodes the repeat is just a few seconds, but with the three-and-a-half-hour Taylor Swift: The Eras Tour, it can be closer to a minute.
I think the reason for this is that it tracks your viewed time in percentages of the total length. A lot of streaming services record the last timestamp or keyframe you watched, but percentages would explain why this is happening on Disney+.
All services won't keep your viewed time completely up to date in real time though, because the client will only send a "I've watched this bit" only once it has played it, so if you hit stop between those pings, the server will send you back to the last successful one.