Set zone duration to default

I am using a fixed type schedule with seasonal shift. When I first set up the zones and schedule earlier this spring I adjusted up the durations because at the time they did not seem long enough. Now with the seasonal shifts that have occurred the durations seem too long.

Is there any way I can set the durations back to the default to what they should be?

EDIT: I solved it by deleting the schedule and reentering the schedule with the original parameters. The durations did change a little.