I believe I have that question right. In other words, wine I believe is 5 ounces. How much for bourbon?

I purchased a Riedel Bourbon glass. Of course drinking spirits with more alchohol is not chugged down but rather sipped as I have learned. I am new to drinking whiskey in general so would like to know what the custom is. If I go into a bar(which I probably won't...but rather a restaurant WITH a bar) and would order bourbon neat, how much can I expect in a glass?