It is me again!
We use when, not while, to talk about something that occurs at the same time as a longer action or event that is described in the main clause:
Does "occurs at the same time as a longer action" mean "concurrently / simultaneously with"?
If one action is longer than the other than they can not be truly concurrent. Maybe they both start at the same time. Maybe they both end at the same time. Maybe there is no correlation.
I would say that they overlap. Sometimes a picture really is worth 1000 words.