I don't think anyone has used Urushibara for the reduction of your particular benzyl alcohol, and thus you cannot be spoonfed the data.
Just use a huge excess of U-Al-Ni, and run it overnight. If you get no conversion, try it at reflux. If you then get tars, lower the temperature again. If you succeed, then lower the U-Al-Ni ratio as far as you can without losing yield. You need to experiment yourself.