"scheduled hour" is grammatically correct and commonly used in written English
It refers to a specific time that has been planned or arranged in advance. Example: The meeting will take place at its regularly scheduled hour of 9am. In this sentence, "scheduled hour" indicates that the meeting has a set time already planned, rather than being arranged at the last minute.
By the end of the scheduled hour, Mr O'Leary appeared to be enjoying the banter.
At the scheduled hour, 8 p.m., three times the invited number had gathered at the museum's main entrance.
That's why when I saw his Edinburgh show, it stopped after only 40 minutes instead of the scheduled hour.
Hundreds of people lined up three hours in advance for a recent Morgan autograph signing at the store; Barnes said Morgan stayed longer than the scheduled hour yet still could not fulfill every request.
Shortly before 3 p.m. on Saturday, the scheduled hour for the session, most of Iraq's top political leaders and the American ambassador, Zalmay Khalilzad, slipped into a conference room in the Convention Center, where the legislature meets.
Though the speeches were short, the dinner was not, dragging on well past the scheduled hour, as outside in the garden, more than a thousand people began to gather in anticipation of the night's big attraction: a live performance by Kanye West.
Many of the school's 3,600 students come in voluntarily before and after scheduled hours for elective classes and activities.
The three further scheduled hours of coverage on BBC2 meant good news for fans of hastily assembled reruns of Planet Earth, Coast and Flog It.
Summaries of equipment downtime records show that average downtime for processors was about 7% of the total scheduled hours for all four work schedules.
During fiscal year 2009, the APS delivered X-ray beam to the scientific community 97.7% of scheduled hours (availability) and with a mean time between faults of 77.5 h.
For harvesters, the average downtime was about 10% of the total scheduled hours for three of the four work schedules; average downtime for the 12 hour work schedule was somewhat higher at 17%.
