Great question — answering as the UphillTech team:
It's a matter of taste. Since your durian is already cut, as it continues to ripen (which it will, although much more slowly than uncut fruit) it is also rotting/fermenting (which is desired by many). You don't say where you are from, but durian season is long over in the northern hemisphere. Most durian sold in the US this time of year has been frozen. Previously frozen durian rots more rapidly and ripens less rapidly than fruit that hasn't been frozen, some sources say that previously frozen durian won't ripen at all, only mature (rot). So the bottom line for you is that you should taste your durian every 12 hours or so and put it in the freezer (or consume it) when it has matured to your...
Full answer by Jolenealaska: https://cooking.stackexchange.com/a/64142 (CC BY-SA 3.0).
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