An hour and a half interview for an entry level job?

I legitimately do not want this job if I'm offered it, but it's a great opportunity. It's for an entry level paralegal position, and it's a great firm. Should I still take the interview?

I'm a senior and I'm aggressively applying for other jobs until I can go to grad school, and I've gotten a good amount of interviews. Should I take this interview for experience? It's in a genuinely depressing city, but it pays very well. I guess you can't tell me one way or the other, but any advice would be appreciated.

Is an interview of this length common?

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