You can sign up for the tournament anytime between midnight Monday morning and 7 pm Tuesday. Everyone who signs up anywhere in that time interval is part of the same tournament. Preliminary matches to bring the field down to 32 happen on 8 pm Tuesday, then another round at 8 pm on each of Wednesday, Thursday, and Friday. The semifinals and finals are at 8:30 pm and 9 pm on Friday. The timer is that you have to wait for the scheduled time of the next match before it takes place.