I'm kinda new at this, but I've found that a good yeast culture will speed up the fermentation process. The purpose of the culture is to have a vigorous yeast colony that is adapted to the must environment before it is pitched in to the must.
They last three batches I have made fermented from around 1.080 to 1.005 in 2 to 2 and a half days. Two were made with D47 and one with Montrachet.
The night before I start the culture and the must I take the yeast out of the refrigerator and put it on the cabinet so when I'm ready to start the culture the yeast are well acclimated to the temperature. FWIW, we keep our thermostat at 72 during the day and 68 at night.
The next day I prepare the must in a 6.5 gallon primary bucket, including the nutrients, acid, pectic enzyme etc..
Into a sanitized 2 cup sized Pyrex measuring cup I ladle two cups of must and cover tightly with aluminum foil and set aside.
Then I start the culture. Into a 2500 ml tapered flask, I pour 1 cup of distilled water. Then I pour in the yeast and cover loosely with aluminum foil. I let the yeast soak in the water until all of the yeast has fallen to the bottom which takes about an hour. I swish the flash mixing the yeast into the water.
About 2 hours later I add 1/2 cup of the must and swish the flash as before then cover it as before. I repeat this step every six hours until all of the must from the measuring cup has been added.
About six hours after I add the last of the must to the culture I swish it one more time and pour it into the must. After I pour the culture in the must, I stir it vigorously. When finished stirring, I cover the must with a piece of cotton cloth held on with a piece of elastic.
I try to vigorously stir the must at least 4 times a day. In 2 to 2 and a half days the must has been fermented dry and I strain the must into a glass carboy and cap it with an air lock.
HTH