The No Interrupt command informs the schedule that an interruption or time delay cannot occur between the current operation and the previous operation.  That is, the current operation must start immediately following its predecessor. 

The No Interrupt Days expands on the No Interrupt to specify how long (in calendar days) the operation can be delayed before the no interrupt fails.  If the No Interrupt days is 0 (the default), then the operation must start without any delay immediately after its predecessor; if 1 day, the operation must start on the same day as its predecessor; if two days, it must start within 2 calendar days, etc.

For the No Interrupt Days no work, the No Interrupt must be selected.  Both parameters are selected in the Option section of the Mfg Order Job Details Operations Grid.