We charge our security prewires as a per drop basis with a minimum of 4 drops. We estimate about 22m and 30min per drop (with an average sqft of 2000'). If larger houses then we up both the wire length and time.

The difficult part is if you aren't going to finish the security you have no understanding of how a security system works and what limits you have for wire lengths, thus you don't know how many sub panels you should account for and where they should be located to maximize efficiency of the security system.