After working with so many people from India, I would guess this person was originally from there. “Since 20 minutes” is a fairly common way that they say it.
In French you would say “depuis 20 minutes” which literally translates to “since 20 minutes,” and I imagine many other languages would phrase it the same way.
The sentence structure that people from different non-english-speaking countries use is really interesting.
After working with so many people from India, I would guess this person was originally from there. “Since 20 minutes” is a fairly common way that they say it.
In French you would say “depuis 20 minutes” which literally translates to “since 20 minutes,” and I imagine many other languages would phrase it the same way.