How many candidates are usually invited on-site for an interview?

I just had a video call interview with the hiring manager. We connected really well and she even mentioned she would hire me now if it was solely up to her. I will be coming on site to interview the entire team, it will be panel style and approximately last 4 hours.

I’ve been searching for over a year and I’m so exhausted with the job hunt after dozens of failed interviews. I’m optimistic for this one but also very nervous because I feel there’s a lot of pressure to succeed.

I’m wondering in this type of situation, how many other candidates do I need to compete with at this stage?