Check out these two recent posts:

Math Operation Calculating Previous Values | Community (nintex.com)

Unable to Access Calculated Variables | Community (nintex.com)

So I reviewed those posts and I’m still stuck. Here is what I am working with:

This is the section of the workflow I am working on. The goal is to get each employees time entries for the given week, add the submitted time together, and store that total in a new list item on a different list. It successfully queries the list for each entry based on employee, but I am completely lost on how to get the sum of entered time.

To simplify: For each employee, get their time entries, add together all of the weekly regular hours entered, and update a corresponding list item in a different list with the full total. 

For each:

This is the list query to get their entries:

This is the math operation where I am stuck. The numbers I need to add together are all in a collection variable. Do I need to turn the collection into something else before this?
 

And this is the update item, which does work correctly when I tested the math operation using basic values. 

Below are images for an online of how you would total the weekly hours for each employee. Please let me know if you have any questions.

It worked! Thank you so much!

You’re welcome. Glad I could help!