The question "how many hours until" is incomplete as it does not specify the event or time until which the hours are to be calculated. Generally, to find how many hours until an event, you subtract the current time from the target time. For example, if the current time is 11:30 AM and the event is at 4:00 PM, the time until then is 4 hours and 30 minutes. To calculate the hours until a specific date or time, it is necessary to know the current time and the target time or event.

Please specify the event or the exact time or date you want to know the hours until.