Right around 70 hrs...
In all seriousness, if you plan it right and weather cooperates you can do 6-7 hrs a day.
Get up early and don't mess about, have the engine running by 8 am.
Early lunch followed by an hours snooze then go out and do another 3-3.5 hrs.
Dinner and in bed asleep by 9pm and do it all again.
Take one entire day off then fly another 6 days.