IIRC, the caution clock was set at 20 minutes.The caution clock morphed into stages. Just hope that they won't decide their 'games' need four quarters rather than three periods.
What I mean is that the caution clock disappeared into the bin of discarded experiments the year stages were born. I agree that the present stage configuration is superior to a clock, though I'd prefer they weren't there at all.IIRC, the caution clock was set at 20 minutes.
I actually like the stages as an interesting tactical element, but a 20-minute caution clock eliminates all green-flag pit stops.