New York Marriott Downtown (FiDi) - club lounge open hours catering to business crowd, recalling from my memory
M - Th: 6:30 am - 10:00 pm (Breakfast from 6:30 - 9:30, Hors d'oeuvres from 5:30 - 7:30, Desserts from 7:30 until closing)
F: 6:30 am - 11:00 am (Breakfast from 6:30 - 9:30)
Sat: Closed
Sun: 5:30 pm - 10:00 pm (Hors d'oeuvres from 5:30 - 7:30, Desserts from 7:30 until closing)

(Sat/Sun - buffet breakfast served in the restaurant)