how long has it been since pm

The question "how long has it been since pm" is ambiguous, but if the meaning is to know how much time has passed since the most recent 12:00 PM (noon) today, or since the current PM time started, I can clarify with the current time. The current UTC time is 6:07 AM on Thursday, August 28, 2025. Since 6:07 AM is in the AM, the most recent PM period would have been yesterday from 12:00 PM (noon) until midnight. The time since then would be from midnight to 6:07 AM, which is about 6 hours and 7 minutes past midnight. Or if the question means since the last noon, that would be 18 hours and 7 minutes ago (counting backwards from current time to yesterday at noon). Please clarify if a different interpretation or timezone is intended.