Impossible question, it depends what your app does and what your users do. Even within the same company, 1000 concurrent users of Google Maps will use completel

Impossible question, it depends what your app does and what your users do. Even within the same company, 1000 concurrent users of Google Maps will use completely different resources than 1000 concurrent users of gmail. It'll even change over time for the same app and same users, as their behaviour or the world around them changes.