While you can double the oak for a shorter period of time, it won't necessarily produce the same result. As the wine soaks into the wood over time, different flavors are extracted as the wood is toasted on the surface and less so below the surface.
However, if time is an issue for you (and it appears to be), you can try it. Keep in mind that after fermentation, time is an ingredient in everything you do with the wine.
Winemaking has few hard-n-fast rules, but it has a lot of guidelines based upon things folks have tried in the past.
Personally, I don't let wine go below 0. A friend had a case partially freeze (left it in the back seat of his car), and the wine tasted odd afterward. I had one glass and called it enough. He eventually finished the case (we were young and the wine contained alcohol, so he ignored the taste!
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