How long can you keep a can of spray paint in your book bag?

Hey I need this question answered ASAP. Tomorrow Im heading on a 4-5 hour car ride to see my friend for a week. I'm gonna be bringing a can of Silver spray paint along with me. Im going to be putting that spray paint in my bookbag, along with my sketchbook, pencils, markers, crayons and such. Im going to be in an air conditioned car. but the weather outside will be 15-20C. I just want to make sure, if the can will be okay, in my backpack, for so long? I need this answered before tomorrow! HELP