The following conditions exist at the end of 10 days:
i) Activity 1-2, 1-3 and 1-4 have been completed as originally scheduled.
ii) Activity 4-5 is in progress and will require 6 more days for its completion.
iii) Activity 4-6 is in progress and still require 6 more days for its completion.
iv) Activity 3-6 is in progress and will be completed in one day.
v) Other activities have not been commenced and their original predicted duration will hold good, except for activity 5-7 which will require only three days instead of 5 days originally planned.
Update the network and determine the critical path of the updated network. What is the total increase in the project duration?