After an interview, it is generally advisable to wait about 5 business days (around one week) before following up if you haven't heard back. If the interviewer has given you a specific timeline, wait for that period plus an extra few days as a buffer. In many cases, employers get back to candidates within one to two weeks, but response times can vary widely depending on the company, position, and industry, sometimes taking up to 3 or even more weeks on average. If you haven't received any communication after about two weeks, it's appropriate to send a polite follow-up email to inquire about the status. During this waiting period, sending a thank-you note within 24 hours after the interview is a good practice to express gratitude and continued interest in the role. In summary:

• Wait at least 5 business days (1 week) before following up if no timeline was given.
• If a timeline was provided, wait that long plus a 2-day buffer.
• Send a thank-you note within 24 hours post-interview.
• Follow up around 2 weeks after the interview if you heard nothing.
• Understand that some companies may take longer due to ongoing hiring processes, internal delays, or other factors.

This timeline fits most general hiring practices, though some sectors or large companies may have longer waits.