Timeline is here -- http://www.usms.org/comp/scnats12/timeline.pdf -- so it'll be all heats of a woman's event, then all heats of a men's event. Time between events (even back-to-back) is NEVER an issue at SCY Nationals. If anything, there's too MUCH time between events. Well, except for sprinters ... I hear they're still pushing for that movement to make the 50s as broken at the 25 for 30 minutes.