i worked at a company where i had done over 150 interviews and the company did at least 10 interviews a day at the office i was at. we did metrics on what times of day or days of the week or rooms.

before lunch or 4pm or later interviews we’re worse across all candidates

certain rooms we knew were smelly, loud, or poorly converted from like a storage closet scored worse across all candidates

we took some rooms out of the rotation and made sure everyone was well fed/had drinks. the effect is real