The query "how much longer till" is a general phrase asking about the time remaining until a certain event or moment. To provide a precise answer, more specific information such as the exact event or date/time would be needed. In general, the way to find out "how much longer till" a specific time or event is to subtract the current time from the target time. There are various online calculators available that help calculate the exact remaining time in days, hours, minutes, and seconds until a future date or event. If there is a specific date, event, or time in mind, please provide that so the exact remaining duration can be calculated. Otherwise, tools and steps to manually calculate the time remaining involve:

• Finding the current date and time.
• Subtracting this from the future event's date and time.
• Converting the result into a readable form such as days, hours, minutes, and seconds.

For example, to calculate how long until 4:00 PM if the current time is 11:30 AM:
Convert 4:00 PM to 24-hour time (16:00), then subtract 11:30 from 16:00, resulting in 4 hours and 30 minutes remaining.

Please specify what event or date to calculate the time remaining until.