A system has three components and all three components need to be operational for 24 hours; Monday to
Friday. During a particular week, failure of component 2 occurred as follows:

Monday = 6 PM to 9 PM
Tuesday = 8 AM to 10 AM
Wednesday = No failure
Thursday = 8 PM to 9 PM
Friday = No failure
Saturday = 5 AM to 8 AM
Sunday = 6 PM to 9 PM

What is the mean time between failures on component 2?