I have a simple Numeric formula field that calculates the sum of 2 other fields.

How do I convert this "calculated number" into a field that displays hours? I have tried the following:

[Field 1] = 10

[Field 2] = 2

[Field 3] = [field 1]* [Field 2] = 20

[Field 4] = Hours([Field3])

Problem: Now field 4 formula is not pulling through anything

How do I convert this "calculated number" into a field that displays hours? I have tried the following:

[Field 1] = 10

[Field 2] = 2

[Field 3] = [field 1]* [Field 2] = 20

[Field 4] = Hours([Field3])

Problem: Now field 4 formula is not pulling through anything