Working a full time job with family and hobbies is incredibly time consuming. I'm not going to squeeze in 6-10 hours of interviews for a company before I ask an important questions about company culture, PTO, benefits, salary etc. I'll ask the questions I find important in the first interview, if it isn't a good fit I just saved me hours of time interviewing at a company I don't want to work at - and I just saved hours of interviewing an employee they don't want to have.