Hi Becca,
No, you didn't miss anything; but that's the second time I've fooled myself into thinking such a format exists, natively. Shame on me, as the saying goes.
That said, I do keep fastidious notes, and (huzzah!) solved this one the first time, back in November last year.
Here is what I did;
Add a category to those special tasks (e.g. Schedule Equipment, Schedule Room, etc.) with a calculated TEXT field called Time Slot Start with a formula of CONCAT(HOUR(Planned Start Date),":",RIGHT(CONCAT('0',MINUTE(Planned Start Date)),2)) and another calculated field called Time Slot End with a formula of CONCAT(HOUR(Planned Completion Date),":",RIGHT(CONCAT('0',MINUTE(Planned Completion Date)),2)).
Noting that these will show in military time (for both brevity and clarity), you can now simply add the TIme Slot Start and/or Time Slot End to any Task view you wish.
As for the calendar, I'd also suggest you edit the Task format (down near the Save button) and "Set each of the Tasks labels to be the..." to "Custom", and in the custom formatting box (to its right) enter "{DE:Time Slot Start} | {Time Slot End}", then save. That way, each event on the calendar will simply show something like "14:00 | 15:30", and users can hover for more details, and then click the links in those details to get to the tasks and make edits.
Will this solve your current requirements?
Regards,
Doug