I took my writing sample about 3.5 weeks after I took my test and I still got my score on time. It never expires, but you have to take it if you want your LSAT score back.
I’d say you have a greater chance at Western, Queens and Ottawa with your current stats. Osgoode perhaps if you rewrite and UofT is probably highly unlikely, sometimes a 175 isn’t even enough to compensate for a 3.5 gpa so I’ve heard
... I went through probably 2-3 question types, each with ... (question type), I kept 3-5 of the tougher questions from ... here was accuracy. Same 3 or less rule applied. ... If I missed more than 3, I studied the questions, ... Sometimes I would get -3 and get to each question ...