Airbus states that both the A380 and the A350-900 initially required over 2,600 flight hours for EASA/FAA certification:
Airbus’ 21st century flagship A380 was certified by the two major international governing bodies – the European Union Aviation Safety Agency (EASA) and the U.S. Federal Aviation Administration (FAA) – in December 2006, following a programme that began more than five years earlier and ultimately comprised more than 2,600 flight hours with a fleet of five test aircraft.
To ensure the A350 XWB’s reliability from the moment it entered commercial service in January 2015, Airbus implemented one of the most thorough test programmes ever developed for a jetliner. Lasting just over 14 months, an industry record, the A350-900 flight test and certification programme comprised a five-aircraft fleet that performed over 2,600 flight hours in total – with Type Certification received from EASA and FAA in September and November 2014, respectively.
(Airbus - Test programme and certification, emphasis mine)
The A350-1000 was certified after the A350-900 and required less flight hours for certification:
The Type certification is a requirement for the aircraft to enter commercial service. This milestone comes after an intensive flight test trials that have taken its airframe and systems beyond their design limits to ensure the aircraft successfully meets all airworthiness criteria. The three A350-1000 flight test aircraft powered by Rolls-Royce engines successfully accumulated over 1,600 flight hours.
(Airbus - Airbus A350-1000 receives EASA and FAA Type Certification, emphasis mine)