verb
BAD : Some teachers neglect how much a student can take in during one lesson.
GOOD : Some teachers forget how much a student can take in during one lesson.
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neglect = (1) fail to look after someone or something properly: 'The garden has been badly neglected and will require a lot of attention.'
(2) (formal) fail to do something, especially something that you ought to do: 'The public are demanding to know why the government neglected to warn them of the oil shortage.'
forget = fail to realize something (and be guided by it): 'Children tend to forget that their parents like to have fun too.'