The rule as was explained to me is that as long as you attempt the objective and have time to complete it before the time for the round runs out, you are ok. If someone fails to leave themselves enough time, you warn them. If they do it again and you are an admin, you kick them. If you are not an admin, you post it in the temp ban section so that an admin will talk to them. If they repeat it over and over, then it is ban worthy.