Using an 'elapsed duration' will help you with this. To do this, I'll provide you with an example. Let's say you have a task that requires a glue to cure for 14 hours, but you want it to continue into non-working time. Simply make the task duration as 14 ehrs, rather than 14 hrs. Adding the 'e' in front of the time units will make it so that it ignores the work schedule.

Hope that helps!