How long is a typical SA superday? And possible scheduling conflict

Not sure how I should preface this so I'll just jump right in.

Bank A: Decent bank, doesn't do much M&A but they are growing.
Bank B: Solid MM, seems like decent M&A, along with other products.

Bank A scheduled a superday for this Thursday (2/13) with me last week and I gladly accepted because I have no solid offers for the summer.

Bank B, who I like better/is probably a better bank, just emailed me today, inviting me to a superday on...Thursday. Bank B said their superday would be 2 hours long, giving me a choice between 10-12 or 1-3.

Bank A, I am scheduled to interview with at 10 AM. I called the HR contact right away at Bank B when I got their email. They are flexible to a point but they would like to get started by 1:30 (supposed to start at 1). So basically giving me 3 hours to interview with Bank A.

I sent my HR contact at Bank A an email after getting off the of the phone with Bank B, asking general questions about the interview and if he could tell me how long/how many individual interviews there would be in the superday.

I guess this is a good problem to have but Bank B (who I'd rather work for) emailed me literally 3 hours after I finalized my flight plans with Bank A and did not seem extremely flexible.

Any advice or someone else been in a similar situation? Thankfully both banks are in midtown and only about 10 blocks apart. Going from downtown to midtown or vice-versa would be a nightmare.

Thanks!