To calculate the total number of hours in 8 hours a day, 5 days a week, we need to use the formula:

Total number of hours = hours per day x number of days per week
In this case, we have:
Total number of hours = 8 x 5 = 40
Therefore, the total number of hours in 8 hours a day, 5 days a week is 40.
This means that if someone works 8 hours a day, 5 days a week, they will have worked a total of 40 hours by the end of the week.
It’s important to note that this calculation assumes a standard 5-day workweek, and does not take into account any overtime or breaks that may be taken during the workday. Additionally, some employers may have different policies regarding the number of hours worked per day or per week, so it’s always a good idea to check with your employer to confirm their policies.