Certification requirement is that go-around thrust be available in 8 seconds from approach idle.
Not exactly.
After 8 seconds enough thrust to perform a steady climb of a 3.2% gradient must be available, this does not necessarily have to be full thrust. Especially at landing weight a twin engine aircraft will be able to do much more than a 3.2% climb at go-around thrust.
Landing climb: all-enginesoperating
In the landing configuration, the steady gradient
of climb may not be less than 3·2 %, with the
engines at the power or thrust that is available
8 seconds after initiation of movement of the
power or thrust controls from the minimum flight
idle to the go-around power or thrust setting