Using Johnson's rule for 2-machine scheduling, the sequence is: Scheduled Order Job 1 A 2 3 4 5 6 For the schedule developed using Johnson's rule, the total length of time taken to complete the six jobs (including the 2nd operation) = hours (enter your response as a whole number). Six jobs are to be processed through a two-step operation. The first operation involves sanding, and the second involves painting. Processing times are as follows: Job Operation 1 (hours) Operation 2 (hours) A 1 3 B 10 12 8 7 D 11 9 E 4 6 F 2 13