How can I find out how many hours students actually spend in a laboratory?

First check the laboratory’s official page and guidance for undergraduate or master’s research, then ask the supervisor, current students, or graduates during a laboratory visit or information session: “How many hours are students usually here in a normal week?”, “How much does this increase during busy periods?”, and “Does that include analysis or literature work done at home?” Actual time varies by field, year, laboratory, and student, so speaking with several students can give a more realistic picture.