Is this true about the duration of radiation

[The8]

Hey, can you guys look at the attached images and explain whats up with the logic .... I didn't know this was instantaneous but apparently it is.... the energy should be additive, no?

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[aldol16]

Duration of excitatory radiation doesn't matter because once one quantum of energy is absorbed by the surface, it emits some level of radiation that corresponds to the excitatory radiation literally at the speed of light. Therefore, there's no time for the energy to build up, or become "additive" as you say.