The CBS queue time is calculated when the operation gets scheduled by Advanced Planning Board.

The field description has the following explanation:

If the operation is scheduled by Advanced Planning Board, this is the number of hours that it needs to wait in queue before it is scheduled to start. This is calculated each time the operation is rescheduled. If the operation is CBS unscheduled, there will be no CBS queue time. This value is calculated as follows.

For the first operation:

If backward scheduled: Operation start time - Latest possible start time (LPST) of the shop order

If forward scheduled: Operation start time - Earliest possible start time (EPST) of the shop order

Other operations:

Operation start time - End time of previous operation - Transport time of previous operation

I.e. in your example, the order is forward scheduled, and you have queue time on the first operation, which indicates, that the value should be the number of hours between EPST on the Shop Order, and the start time on the operation. The value is expressed in hours.