I'm guessing around 3--4 hours. But when I'm really working I never know for how long I do that. But I think should know for how long I actually work. But it's

I'm guessing around 3--4 hours. But when I'm really working I never know for how long I do that. But I think should know for how long I actually work. But it's a relief to see so many people in 3--4 hour category :)