MM to Bulge Bracket Lateral

I currently work at a middle market bank in industry coverage in NYC.

I just received a lateral offer from a larger bank. I'm likely going to accept but recognize that things have probably been relatively easy on me here (80 - 90 hour weeks). I'm just wondering how big the difference in culture will actually be.

If anyone has made a similar move or can offer some insight I'd greatly appreciate it. Understand this is largely group dependent as well.