I'm in the later years now, so I'm more cautious about loosing my account. However when I was in earlier years I did log on during the end of FM without getting banned. I used to log in during the last 5-10ish minutes and rush to win the reward.Could I play around 30 minutes before the event ends or is it still risky?
If you really need to log in for some reason (to stop a TLSQ from running out etc...) then wait until the absolute latest that you can.