. . . or at least, it isn't just for W8.
This was an interesting observation made over the weekend. I have a four-member party that has finished in Bane and is now scouting through CODS (and then, they'll scout through Dominus, for me; this is all preparatory to yet another party . . . . You've got to love game re-playability, which the Wizardry series has in spades). Anyway, looking for ever more information, I went back to Bane to check the duration of the "adventuring" spells: magic screen, direction, detect secret, etc. I was curious about such issues as "do two level-1 castings last as long as one level-2?" and so forth. I recalled from a previous testing that a level-1 detect secret spell had lasted about 30 minutes, but I thought I'd better try them all just to see. We cast all of the spells at level-1, and then just started wandering around, and they lasted, and lasted, and lasted . . . . I did not take close notes, but direction lasted the longest, at over two hours (~140 minutes). That was substantially longer than my old recollection, so I thought I'd test it: I created a new party, gave them ~20,000 experience, so they could get some of these spells, and then had them cast. The result: much shorter durations.
Hypothesis: whether it is character-level-based or attribute-based (intelligence being one good candidate), more adept characters are getting more bang for their buck with their spells.
I am preparing a grant proposal to the NSF for additional research.