Hello, Robin just directed me to this topic. Having a greyhound in NYC is eminently do-able. I've had them for 21 years. With dog walkers, grocery and pet food deliveries, etc. most of the logistics are easily handled. If you can take your pup for a good long walk in the morning and a couple more at night, you should be fine. Depending on where you are there are parks all over that are easily accessible. As I am also at a bank, I will say that it depends on what part of the bank you are going to be working in -- IBD hours are generally the longest, other divisions can be much more 9-6 ish. I can't PM you and I don't think you can PM me but you can call me at 212.816.0564 and I would be happy to talk to you. As I used to work in the analyst program at another bank, you should be getting your offer in the Fall so that will give you lots of time to plan.
Edited to add: there are 4 greyhounds in my immediate neighborhood on the Upper West Side. I know of many others here in the city as well. There is a Meet-Up group (can't look it up at work to link it for you) that meets fairly regularly, maybe you could go to their July meet-up and talk to other NYC owners. We all have jobs, many of us have long or irregular hours. A good dog walker is a must in this city but a job and long hours should not deter you.
Do talk to UESBrindle, Elizabeth and Rob are great and their William was a great city dog. He and his brother Harry are now great country dogs but they still come back every so often for a nice long walk in Central Park with me and Aquitaine.