@ludders, I agree with
@Tim3, the recipe sounds risky. Marguerite Patten wrote a lot of books about cooking, including "Homemade Wines and Drinks (500 Recipes)". There is no guarantee that she actually tested the recipe you're reading; she may have acquired the recipe during research and simply included it.
Also keep in mind that recipes from more than 40 years ago typically don't consider "modern" winemaking techniques and products. A lot are ones where someone had success a few times and passed it around, or they wrote down what they remembered their parents doing. Not always correctly or completely.
I did a quick search for "wheat wine recipe". Most hits were for a type of barley wine, but I found this one which appears reasonable.
Winemaking Recipe for Wheat Wine, How To Make Wheat Wine: Wine Making Guides (wine-making-guides.com)
A few tips: 1) buy a hydrometer (if you don't have one) and use it to determine when fermentation is complete. Don't use elapsed time.
2) 4 lbs of a sugar for a 1 gallon batch is WAY too much sugar. 2 lbs sugar in 1 gallon water is SG ~1.090, which is a bit over 12% ABV. Add the sultanas and the ABV is probably over 13%. 4 lbs sugar calculates to 24% ABV ... except yeasts stop at ~18%, which leaves a very sweet wine. Plus the initial environment may be too rich so the yeast won't do it's thing (eating sugar, emitting alcohol & CO2).
I suggest starting with 2 lbs sugar and see what the SG is the following day. Inoculate with yeast then, and ferment it dry. At bottling time, stabilize and backsweeten to taste.