I'm 7 days
You say 'I'm 7 days' when you're too tired to fight back and your brain is telling you to go to sleep and forget this whole mess.
'I'm 7 days, bro. I can't even finish this level.'
'I'm 7 days, I just ate a whole pizza and I'm still tired.'
'I'm 7 days, I passed out in math class and my teacher gave me a warning.'