nope, that is not true. ive had the same experience… rush point. team wipe. leaver. game canceled.
edit: instead of making stuff up like Oatmeal there… ill share what i HEARD, so take w/ a grain of salt. one of the gm streamers once said its a leave within 60 seconds, another i heard say 52 seconds… can not confirm either myself. but seems to be accurate.
Double edit: apparently its 30seconds?? link below