The phrase "how many hours until" typically asks to calculate the number of hours remaining until a specified event or time. To find out the exact number of hours until a given time, you subtract the current time from the target time, often converting to 24-hour time format for clarity. For example, if it is currently 11:30 AM and the target time is 4:00 PM, the time until then would be 4 hours and 30 minutes.

If a specific time or event is provided, the exact number of hours until that time can be calculated by taking the current time and subtracting it from the event time. Without a specific time or event mentioned in the query, a general approach to the phrase is to consider it as a request to calculate the hours until a future point in time. Is there a specific time or event this is referring to?