Schedule a 1-hour meeting, just to be sure, and somehow people will use the full hour.
People deviate from the original topics of interest and there is no urgency to conclude the meeting sooner.
We even have Parkinson’s law that explains it:
“Work expands so as to fill the time available for its completion”.
The average number of meetings in a month that managers attend is >55. For executives that even >75.
So, to eliminate the friction of accepting your meeting, trim down your 1-hour meeting to the size of a 30min (or even better 25min) meeting.