As I can understand from the question below, there only limitation for instrument list size. But if I use on demand extraction is there any limitation or not? Unfortunately I could not find the documentation in which it would be indicated.
@Nikita.Baranov, the limit is on the number of instruments linked to a request, and it applies both to scheduled and on demand requests.
The list of request limits can be found online in the Extraction Limits help page (to access that page you need a valid account).