Dude, I feel for you .... cause
I had to go through the same ordeal ....and I live in Canada as well so I feel you man ....brrrr
Idea #1
I went to home depot today .... and this is what I saw (I just dug up this picture to show you the basic idea)
http://www.hardwarestore.com/pop-print/larger-image.aspx?prodNo=58248
Plastic garbage can with a lid (under 20 bucks) .... it will fit your plant for sure ....it will be airtight that is for sure .....it is not to high .... you can put it anywhere.
You could put the plant in .... use the lid .... or make a cover out of a piece of plastic (duck tape around the rim).... then put some dirty clothes on top and make it into a laundry basket ..... if there is a pair of socks and some undies ..... visible .... no one is touching that shit. That worked for me. You could put that in the bathroom while your girl is taking that shower.
You should take a day off .... that is for sure. (how much is this plant worth to ya ??) Just get sick man .... you don't have to tell your boss anything ....people get sick.
Idea #1
If you know your landlord ....(tell him/her ..... you are babysitting a pit bull for a friend ... (who is not exactly friendly to all) you think they will want to walk in when you are not there ?? (that buys you some time ....)
I had this happen to me three wks ago ....I have a pit bull ..... so I left a note on the door ....stating this .... with a comment please knock to be let in or enter at your own risk ...... (the plant was packed) ...... lol they never knocked ....never showed.
Even if you are not supposed to have animals in your apt ..... you are not the owner .... you are dog sitting for one wk .... they can not evict you for that.
When it is all done .... you will have a wicked experience to tell you friends about ..... and a wicked reservoir for your nutes.
Just ideas .... good luck man !!