You know, we have several times touched on the question of "how long is long enough" to live. Maybe the issue we are discussing now was addressed by Epicurus as part of that question - maybe he explored he issue that every calculation of pain and pleasure involves the two major components that seem to me to be the most intuitive - both (1) Intensity (the word we've debated most) and (2) time / extent of the potential pain and pleasure being considered.
I would think given our discussion on that issue so far, it's inevitable that to extend the thought process involves not only measures of "intensity" but measures of "time," with our expected date of death to be probably the most relevant of the potential end dates [limit] of any calculation of future pleasure.