146c5814_What_is_an_Ideal_Op_Amp___Ideal_Op_Amp
[Characteristics] Output swings instantly to the correct value [Real Op Amp] In real op amps, the amplified signal will take time to reach the fully amplified voltage value. This is determined by the slew rate of the op amp. [Ideal Op Amp] 
In an ideal op amp, the output will swing instantly to the amplified voltage value. There will be no time delay between the time the voltage is input into the op amp till the time it is output. It will all be instantaneous.
What is an Ideal Op Amp?
Ideal Op Amp