I’m also looking for an answer on “plan by hour”. Essentially I’m pulling together a Weekend Implementation Plan for a production cut-over. Given the tasks being conducted the best way is to record activities at the hourly level.
So far, I’ve set my project Calendar to 24-hours, but when I add a task (e.g. starts Friday 17:30 for 1 hour) the next task I add defaults to next working day… Really I just need project to understand that all tasks should just take notice of my precedents and schedule without trying to insert any gaps etc.