So...
If a parking sign lists 3 time ranges, one plain, one in parenthesis and one in red, it means you can only park during those times on weekdays, Saturdays and red days respectively.
...but if it lists only one time range in black, and states a maximum duration, the meaning of "non-parenthesis black" magically changes from "you may only park here during these hours on ordinary weekdays" to "during these hours, you can only park here for 3 hours"?
That's not logically consistent at all!