If you're staying off site, you don't want to go on an EE day. On regular hour days I'd say you want to be positioned at the turnstile area at least 15 minutes ahead of time. Allow plenty of time to journey from TTC if you're going that route. MK used to admit people about a half hour prior to the posted time, but I haven't witnessed that since 9/11(maybe they still do on heavy attendance days?)