Here are some visual aids of what I understand to be the difference between "longest duration" pleasure and "long-term" pleasure:
Present >>>>Future
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"Longest duration" refers to pleasurable experience over a single contiguous span of time leading to pain; pleasure clung to in the present with no consideration of consequences.
(ex., eating at the buffet as long as possible leading to indigestion and nausea in the future)
Present>>>>>Future
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"Long-term" refers to pleasures over time punctuated by pains endured for the sake of the continued existence of the pleasure; or painful experience undergone in the present to have pleasure in the future.
(ex., Diet and exercise undergone for health and fitness)