Looks like a total of 34.5 hours to me - $16.50 for 6 hours labor = $2.75/hr labor cost. Looks like left column is materials and right column is labor, so total labor was $95, which is a total of 34.5 hrs at $2.75/hr. So they got all this done in 34 and a half hours; with all their practice, they were efficient. The total cost for design #10 is interesting but seems unclear - $20 or a total of $30? I only have a 1952 catalog in front of me right now; it shows that design #10 was $20. Anyway, if it cost a total of $30 in this repair, that would be 11 hours of work (at $20, it would be 7.25 hours work).