Multiplying Hours Help

I've searched and searched to no avail to find the answer, hopefully you can help.

The story is:

At work, our holidays are now taken as hours off. For example...if I take a Monday off, its 8hrs and 5 min and a Monday morning would be 4hrs and 5 min...What I want to do is calculate how many hours I have taken off throughout the year.

The way I was going to do it was:

Create Table called Times,

Fields = Week, Day, Morning, Afternoon, Friday and 1hour all Data Type "Date/Time"

Week = 37hrs, Day = 8hrs 5min, Morning = 4hrs 5min, Afternoon = 4hrs, Friday = 4hrs 40min, and 1hour = 1hr.

Then create another table called Hol Booking

Similar field names Wk, Days, Morn etc. They would be Data Type "Number"

Now in my simple head, I thought I could simply record how many weeks or days off i had off. Then create a query (for example) Week*Wk to calculate the amount of hours I had off.
In simple terms if I had 2 weeks and 2 days off, the query would multiply Week (37) by Wk (2) and Day (8:05) by Days (2), giving a total of 90 hrs and 10 min.

I know there is a datatype mismatch, but is there a way round this.

Thanks for listening