I consulted Aexoden, and he said it took about 10 game hours to level from about 75 to 99 with all bares with Berserk and white magic (for healing between). Said about 10 million experience was needed.
of course he had it going in turbo, so it was about 5 real hours.
and I think that was using the method starlight angel mentioned with iron giants in world 3.
