Actually the average seating capacity is closer to 210 per aircraft, rather than 180. Don’t forget out of the c.90 aircraft based, 20 are wide bodies and a further 20 are A321/B757s.
By my reckoning the based capacity equates to over 19,000 seats - over half of this at T1. With declared terminal capacity of 3000 departing pax per hour at T1, the first wave needs to stretch over almost 3.5 hours. This also doesn’t factor in night stopping LH flights.
Of course this assumes every seat is taken, but as we approach peak summer the likelihood is they pretty much will be.