By our count 331 is how many styles are in the...
_Autodesk Civil 3D (Imperial) NCS Extended.dwt
How many styles are in your custom template?
Note: Our current KETIV Technologies drawing template contains approximately 540 styles.
Having custom styles that exactly represent Civil 3D objects and/or their annotation as they need to appear for final construction documents is likely the single most important factor that contributes to the positive satisfaction of users with Civil 3D.
Allow me the clarify what that means...
if appropriate, specific styles are available, they can generally be easily applied; and because of the dynamic nature of Civil 3D, user input can end with the modification of objects (such as an alignment). The annotation will update automatically and because of a custom style it will look correct.
So I ask the question again. How many styles are in your custom template?