Honeywell DCP552 Mark II User Manual page 146

Handling Precautions
In a timer code event, an On Time or Off Time setting that is the same as
or exceeds the segment time is invalid.
Note, however, that when there is a G.SOAK wait at the end of a segment
or an END mode at the end of a program, an On Time or Off Time setting
that is the same as the segment time is valid.
When the event is an event off
Such event items on the programming map are skipped and not displayed.
When the event is an instrument event
Such event items on the programming map are skipped and not displayed.
Chapter 8. PROGRAM SETUP
8-11