We take that stuff seriously here, so you better get out there and find a badminton game that you can jump into for the next 8 hours!!!
No, but really, like eKatherine said, if you just click on the activity in your diet calendar, it will give you a drop-down menu to either "increase by" or "reduce by" any number of hours/minutes.
Someone who is busier than you is working out right now.
There will come a day when you can no longer do this. Today is not that day.