CASE filter

I'm trying to put a CASE filter on a field to return and either/or response..

My goal: When the "opened time" is checked to see if a call was responded to with in a 24 -48 hour period vs anything beyond 48 hours the desired results are not being returned..

I believe I'm getting hung up on what verbiage to use (contains?) in the case statement.  I need to verify and assign this to the proper person.

Here's what I have currently: CASE SLA."RespTime, WHEN RespTime ,= 1 AND RespTime <= 2 THEN 'Yes' ELSE 'No'

Any suggestions would be appreciated.

 

Thanks