I've been working for this client between 3 and 5 days a week for about a year and a couple of months - I've had somebody else work with me for 3 of those months.
The result of our labour according to SLOCCount :
Total Physical Source Lines of Code (SLOC) = 29,340
Development Effort Estimate, Person-Years (Person-Months) = 6.95 (83.38)
(Basic COCOMO model, Person-Months = 2.4 * (KSLOC**1.05))
Schedule Estimate, Years (Months) = 1.12 (13.43)
(Basic COCOMO model, Months = 2.5 * (person-months**0.38))
Estimated Average Number of Developers (Effort/Schedule) = 6.21
Total Estimated Cost to Develop = $ 938,587
(average salary = $56,286/year, overhead = 2.40).
SLOCCount, Copyright (C) 2001-2004 David A. Wheeler
Very nearly a million dollars!
At a cost of about 80,000 dollars (at a 2:1 exchange rate with GBP).