We Adore Him is designed to support the traditional devotion of a "holy hour." Accordingly, we assume that the length of an adoration commitment is one hour long. There is not currently a setting to change the length of an adoration commitment.
For simplicity and easier scheduling, we assume that adoration commitments start at the top of the hour.
If circumstances require a particular hour to be less than a full hour, you might add a custom title to the hour explaining that it starts late or ends early. Learn more.
Can I Use Staggered-Start Mode for 30-Minute Commitments?
You could enable Staggered-Start Mode and tell your adorers that each adoration commitment is 30 minutes long. But the software will show that the commitment is for one full hour, which could confuse your adorers.