Hello! I am so sorry that I am just now responding, I hope it isn't too late.
So, how fast did I have to make a decision? Seton was my top choice, so I immediately accepted the position. However, I did have another job at another hospital, and they only gave me a week to decide. I imagine Seton would give you the same amount of time. From getting a job at two hospitals, I would just say to accept the one you get first (bc let's face it, it's not easy to get a job these days), and if a better one comes a long, just call them back and say you got another offer that fits better for you. You are allowed to do that. Even though I felt terrible about doing that, I asked a lot of people, and they said that the most important thing to do is look out for yourself and what truly works for you.
I don't mind answering questions! Let me know if you have any other ones.