Work Culture In India

Hi am a fresher working in an IT company as SDE intern. Wanted to know if most of the Indian companies follow strict schedule? This is because I have heard people doing 9-5 job. Often they are having meetings after 5pm and sometimes working on even Saturdays. Does this thing holds for Service based companies like Infosys, Wipro, TCS etc or its true for FAANG or famous startups as well?