Hi @npirillis,
There’s a more voted on feature request for duration/timeslots here: Duration/Timeslots for Calendar.
In the meantime you can look at Calendar Plus for time blocking needs.
We’re creating the most powerful calendar for monday, and time blocking is one of our use cases:
Calendar Plus supports time blocking of items and subitems right from monday. No syncing with other tools, just use the tasks already on your board and drag, drop, and resize.
We’re always looking at how we can support people schedule, collaborate, and gain insight into their days, so don’t hesitate to send us a message from our app or app listing.