Determining how long it takes to do an EEG in a child depends on the specific type of EEG that is being done: firstly, it takes about 5-10 minutes, if the child’s EEG is of the normal type of EEG, at this time it will only take about 5-10 minutes to do the EEG in the child, and the waveforms of the immediate EEG can be recorded. Secondly, it takes 24 hours, some children’s EEG has to be recorded for a longer period of time, especially if the child’s seizures take place at night, at this time, the child needs to be given a 24-hour dynamic video EEG, which will take 24 hours to be done in full.