i'll add as i know more, but, what i think is now the case is: 6 weeks, 1 race per week, wednesdays, various time zone options. one 35 minute bike race, mass start, but no-draft, so, you'll want to switch out to a tri bike, deep wheels, aero helmet and so on. then, 10min gap, my guess is that you'll back out of zwift, re log in, you'll log into "run" this time, and you'll have pre-entered (of course) the run event. no, you can't do the bike in an earlier time zone and the run of a later time zone. this is a couplet of events. you'll enter the bike race, then a run race that takes place exactly 45 minutes later.
zwift duathlon home is here.
you complete a number of meters in the bike race over that 35min period. then a number of meters in the run event. you get 1 point for every 5 meters cycled and 1 for every meter run. most points win. you do need to wear a HRM to score.
as i know more you'll know more, but, this is what i know as of this moment, and i absolutely intend to race this. if i can predict, think herbert's going to be all over this as well. it's going to be fun.