I see 51st and Green has now been able to simplify their opening hours - Open every Wednesday to Sunday from 07.00-14.30
I have a flight on a Tuesday at the end of November! I fully accept that access to a lounge is not a right but I find this strange - I'm thinking of booking a flight from DUB-JFK, the cost includes a lounge if you fly on a Wed but not if you fly on a Tue - although it is the same price!
I've had a cursory glance (time on my hands) and at the end of November there are 5 USA bound flights on a Monday during opening hours, 7 on a Friday and 6 all the other days - not really any variance.
My first world problem of the day!