It's important to realize that moving on takes different amounts of time for different people. (elitesingles.ca)
But studies have shown that dogs respond differently to their owners being gone when the owners are gone for different amounts of time. (topdogtips.com)
This usually involves some trial and error, which can take different amounts of time depending on the student, but it is no less valid a process if it takes longer. (nextgenlearning.org)