Is it bad sign if my hour interview only lasted 30 minutes?

Sometimes, interviewers are able to gather the necessary information in a shorter amount of time. It's also possible that the interviewer had scheduling constraints.

It's natural to feel concerned if your interview ends earlier than expected. However, the duration of an interview doesn't always indicate the outcome. Sometimes, interviewers are able to gather the necessary information in a shorter amount of time. It's also possible that the interviewer had scheduling constraints. If you're feeling uneasy about the interview, it might be helpful to reach out to the interviewer or the hiring manager for feedback.