Assuming your times are in A1 to D1, then try this:

=(D1-C1+B1-A1)*24

Format the cell as number with 2 dp.

Hope this helps.

Pete

On Mar 28, 12:00 am, lili wrote:
example IN 2:45AM, Lunch Out 12:00PM, Lunch In 1:00PM, Out 5:00PM
=13.25