Prague is 7.5 hours behind Adelaide
Best overlap: 3:30 PM to 6:30 PM in Adelaide is 8:00 AM to 11:00 AM in Prague.
Plan around 3:30 PM to 6:30 PM in Adelaide, which is 8:00 AM to 11:00 AM in Prague, to catch everyone during office hours. A 3-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day.