Answer: Compressed workweek
Explanation: Compressed work-week is the situation that occurs by compression of the work schedule so that the working hours can remain similar per week , just the traditional number of working days is reduced in a week.
The situation mentioned in the question states about the compressed work week situation in which employees want to work in fours days a week (working 10 hours a day) rather than working the usual 5 days a week(8 hours a day).Therefore, the number of working days become less and working hours remain same.