I Thought BBQ's Were Made For Cooking Meat On!

So,  my housemate decided (whilst I was napping) to get my BBQ out of the shed and burn her own private papers on it. Yes, papers. Even though there is a perfectly good paper shredder in the house which works just fine.

HELLO????

Then, she comes in and tells me what she's doing and tells me that I should close my bedroom window. Yeah, a bit too late for that, so then my fucking room stinks of smoke, even after I sprayed Oust everywhere, it still stank

I said "I wish you wouldn't use my BBQ to burn your crap on"

No reply to that.

Well, I heard a mumble.

She's moving out end of September.

How many weeks is that exactly?